Sorry about the wall of text below, it's mostly to dissuade people who haven't bought FortressCraft yet from doing so. Also, I was mad at how terribly the developer rushed this game out and I needed a place to vent. It's all valid criticism though, so if you're undecided on whether to get it or not, or just want to know more about it (mainly the flaws), give it a read.
I too have bought FortressCraft, and I must say, OP, you're being incredibly nice about it. This has got to be one of the buggiest, unfinished loads of shit I have ever seen released seriously for any platform. I mean, honestly, I start up the game, and I press the back button because on the on-screen tutorial that it shows you it looked to be corresponding to some command that escapes me at the moment that I wanted to try, but it actually shut down the tutorial. So I too had to find out the controls on my own, and yeah, they definitely rank amongst the top least intuitive and badly designed controls of all time.
But then it got really bad when I actually figured out how to play. I deleted a block on the ground, and was greeted by a nice gaping hole into the skybox. I thought "Wow, that's unlucky, the first block I delete and this happens." So I do it again in a different spot and it happens again. This was on a single player game. It happens so often that I began to wonder if this game had been tested for more than 10 minutes. Another of the biggest bugs is that natural blocks will sometimes have a single, pitch-black side. This will happen sparsely throughout the generated level, but it will sometimes affect a row of blocks, or even an entire wall. It will also happen very often to flat surfaces on any large structure you build, which can get very annoying.
And then, oh my Lord, the online service is the #1 worst, laggiest (word?) online service I have EVER seen. It's just the general lag stuff - people appearing to run in place but are actually moving on their own screen, placing/deleting blocks and it only being client-side, deleting blocks and having the skybox appear behind it - only CONSTANTLY. Seriously, me and a friend were joining random servers (oh yeah, and it doesn't even support parties or invites yet, so we just had to keep searching until we both found the same game), and literally everything we did was client-side, anything the other did didn't affect us physically, nor could we see it.
And probably my biggest complaint, since it's not a bug, or a mistake, or releasing it prematurely, is the relic system. Now, imagine this with me; you start up Minecraft, and there's an update. You find out that Notch has hidden several very valuable treasures randomly throughout all Minecraft worlds. You think to yourself that they would be on the surface, or in rather large shrines, or surrounded by a special material, that you could make a tracker, or at least that they would emit some kind of sound when you got close. But you find out that each item is hidden completely randomly, ANYWHERE underground, throughout the world, they take up one block of space, and there is absolutely no indication of location other than direct line of sight. No tracker, no special material, no noise. Can you imagine trying to find these things without cheating somehow? Because that's exactly they did with the relics. But of course, the game does allow you to hook up a keyboard, which I used to find all of them. And in case you were wondering, these are like unlockable cheats, but they're not even well done. There's a speed boost, a jump boost, a mining hat with a light on the front(thought that was a good idea, honestly, or it would have been if I didn't have infinite torches (which, by the way, when placed on a wall will float above the ground in the same straight-vertical position as when placed directly onto the ground, and can only be deleted by placing a solid block over top of them)), night vision (which sucks absolute shit, it literally just turns the screen green, doesn't help with vision at all), a ray gun, which honestly just extends the range from which you can delete a block in a flashy way, and the freeze gun, which when turned on initiates "freeze tag", which makes it so no one can build, and starts a game of long-ranged tag that is IMPOSSIBLE to play online because of the shitty lag and can only be stopped by stopping the server.
Oh yeah, and that is the ONLY way to spawn water at this point, with a keyboard. And even when you are able to place it, it doesn't flow, or fall as it moves away from the source, it just fills everything on and below the level of the source block until it hits a wall, so it is very possible to flood your entire world with one water block. Of course, it's not like water even affects you, it's just a visual effect, which by the way acts as a completely opaque wall blocking anything underneath it, giving you the semblance of one who's cut in half when standing in it. Not to worry though, it doesn't even save water in the level. In fact, if you go onto an online sever, you loose anything you built in your single player game. And if you start a new world, you loose any relics you had collected (although they said this was a mistake, it's just more proof they shouldn't have released this game yet). Oh, and one last thing that got on my nerves, is that you can't even blow up TNT at first; the detonator is a relic. And you can't even determine when they blow up; the fuckin things light themselves, if you have the detonator, immediately after being placed, and explode on what seems to me is a completely random timer.
tl; dr
FortressCraft is a horribly buggy, obviously rushed Minecraft wannabe with no functionality outside of placing and deleting blocks that failed terribly at implementing the one unique thing it had going for it (relics), a terrible online service, and an apparent hatred for any work the player has accomplished (Saved files being constantly deleted by simply playing online, loosing all obtained relics when creating a new world, of which you can have only one).
I don't know when he started development but it couldn't have been that long ago. It seems to me like he just rushed out a voxel-terrain system, slapped a few features on it and called it a game.