Controls are a bit iffy, but not bad. I got the the electro-gun boss, and beat him, but there didn't seem to be any way to exit the level, and the wall of electro-tiles killed me...
Placing a block is extremely touchy. If you're off by just a bit, you'll lose 50 points. There's also no way to put a block back without losing 50 points.
 "Green Demo"){kind=icon}
 "Geo"){kind=icon}
 "Amberial: Nebulosa Realms"){kind=icon}