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I just bought this via the Humble store, and both the Steam version as well as the DRM–free version simply quits on launch (Mac OS X).

Since the dawn of flash games this bugs me to death. We germans have the Z where you have your Y and thus on flash games of any kind, that forgets about that, we have to do finger ballet on the keyboard or use external software to switch the buttons or even have to set our keyboard to another language. The "big" problem on the whole thing is, for devs this would be such a super easy thing to go around by either checking the keyboard language or even easier to give Z and Y the same ingame command. PLEASE I...

I don't know if it is broke or not upload to steam server yet. I am unable to load the demo.

After playing the game for roughly 15 hours i just mastered all 12 main-levels and thus unlocked all achievments. Thanks to the devs for this nice, little game. Considering the low discount-price from HumbleShop/Bundle, it was well worth the money. Although in between I was frustrated quite often when things didn't work out the way I wanted them to. But Cubtractor is one of those games that just don't let me go until I beat it. And once you do it, you enjoy the victory especially. Hence this post. ;)...