The idea is awesome.
Like people said below, it needs just a little more care.
The guy below explained the problem of random pieces, I add also the bad difficult curve. The game starts too easy and jump for too hard without giving me the chance to develop playing skills and get used to the game.
Even so I'm recomending this game to my friends.
Hope you release later a better done version, cause the idea itself is kick ass.
15 minutes and walkthrough on lvl 7
great game, good concept. only problem is i think those disappearing blocks of level 7 and a few higher levels kill the game. I'm not one to say something is too hard to learn, but its an unnecessary addition that adds nothing of value to the game play. I liked everything else about this game though. overall good job.
AAAAAAAH, LEVEL 7 AAAAAAAAH
Fuck, there has got to be a better way of doing that... I always hit the block to the side of me as well, and my path back up to the "surface" evaporates. It's frustrating as hell. Sorry I can't offer any ideas on how to fix it...
Press R genius
Interesting but frustrating
This game had a lot of potential. A lot of people's frustrations obviously come from not knowing a few of the little tricks you can do while platforming (like the C shaped jump you can do while directly under a block with an open space above it), which allow you a lot more flexibility with placement of the tetris pieces. After discovering this I actually started having fun!
In the end though that fun was crushed by you going out of your way to make placing the tetris pieces a frustrating experience, if not the most frustrating experience possible. Placing the pieces is by far the most time consuming part of this game as a single error anywhere in the process sends you back to the very beginning. This isn't so bad early on but later, some of the longer puzzles have you placing a ton of pieces that must be played extremely precisely in order to complete the level. When combined with being handed pieces at random it makes getting through the later levels much more of an action/arcade style game than a puzzle type (and people who like puzzle games don't necessarily have quick coordinated fingers, you know).
You just go out of your way to make completing levels really hard and frustrating for no good reason. I'd really suggest dialing back the difficultly of placing pieces and allowing you to just restart the platforming bit rather than absolutely everything. Personally I'd even remove the random pieces and probable the automatic part of the falling as well.
If you make the above changes you could then also use nonrandom pieces to help introduce people to a few of the platforming tricks at different stages in the game and in general make the difficulty curve a lot smoother and much less jagged.