I'm afraid it's just not any fun. Issues are that 1) It's not a puzzle platformer since there's no puzzle element to it. I admit that I stopped playing pretty early so I don't know if some of the later levels will actually have more of a puzzle to them, but so far it was pretty obvious how I wanted to build a bridge to the goal. 2) Horizontal movement is way too fast. The only real challenge from the game was in positioning the block as far on the edge of the previous block as possible without going off, but that sort of challenge doesn't make for a fun game. 3) The level completely resets if I fall off the edge of the last block.
Edit: I came back and tried playing again, and this time the horizontal movement wasn't as impossibly fast to manage as it was the first time I played. Still too fast to get precise block placement when you respawn, but the game is much more playable now. IDK if that was just an issue on my computer the first time around or what. However, now I'm running into new issues. After getting to about level 10 or so, the blocks are no longer always staying in place after I respawn. Sometimes they slide to the left or right (once even downward), and sometimes they disappear completely. It seems more like a bug than intended mechanics. And right now I'm on level 15 and something else is happening: it's not letting me respawn in some areas that are clearly red or non-gray. I see a way I could get through the level even without being able to respawn there, but the blocks slipping around (pretty often now) is keeping me from using that approach. Playing in Chrome on Windows. Will try refreshing the page now to see if that fixes it and edit if so. -- Still running into the same issues, and it looks like blocks spawned from red areas are sometimes but not always doing that, and ultimatum479 noticed it too.