Neat, nicely made platformer, with decent length and a well-balanced difficulty curve (fairly easy/tutorial'ish up to the middle, then ramping up, the last couple quite challenging at times).
One minor annoyance in the boss fight - got killed twice by a stray spike ball after "beating" him, when the "cinematic" mode had already kicked in, making it impossible to move/dodge.
This game is better than it looked initially when I started it up. I wasn't sure at first, from logo to level 1 it didn't look like it was that great quality, the English looks like it's been translated verbatim from another language. But the gameplay more than makes up for it. It's got character, the little cube is always so chilled out looking and you have to be as well to play this. It took a bit of time to get used to the rules (wasn't until level 7 that I discovered if your cubes get destroyed you can't regenerate them) but that was part of the fun too. It's funny in a weird surreal kind of way down to the enemies and characters.
Loved it, especially the boss fight. One tip, on level 20, would be to put the spikes above the fan to make the trap even more deadly.
Fun game! Great work and 5 stars