Idea of the game is really good. I like, but there are some major flaws. Music is a bit repetitive, and sounds like laging. The second issue is speed of the game, or size of the blocks. To much depends on luck, when you don't see coming blocks. If they were coming quicker it would be possible to try a jump, and navigate midair. Script is so, that some blocks are to far, and then you cannot land on them, if you didn't jump befoarhed (without knowing what is coming).
Also green block is very disturbing. Reverse gravity is so quick, that you fall up quicker than down. If there is no block above you end the game, and sometimes you must jump on it. Again to much luck depending, or not predicted in script.
Although game is quite good, something like "Going up", but down, and with minimalistic art. Good luck in future releases.
I love the way this game plays. It is fun and challenging. The only thing I think could be changed is the music. Great job!