The controls are clear, and after 73 fails, I've finished the Level 15 (or 16?) and finished the game. I was thinking I'd quit, but something kept me going, and I have to say that apart from the very annoying sound effects, this game is cool!

Nice game, quite compelling. The sound effects are a bit loud, since there's no music. Very noticeable on lvl12 when you fall down a narrow pit a keep bumping on each side. I found that the red square enemies were an annoyance, since their cycle don't reset after dying. Makes some part of the game quite random and some deaths unavoidable. I found that the level design was very good, some great ideas here and there. Didn't use the slow button at all.