I'm rather enjoying it. Variety of guns, smooth animations and clean graphics with responsive controls. Fast enough to make me pay attention, but not punishingly difficult. An entertaining diversion.
You didn't even want to PRETEND you were making an original game here, did you. This is nothing but a new skin on Pixelvader. Next time, at least try to add SOMETHING of your own.
The upgrades and achievements are nice, but the graphics are bland, the towers are few, the in-battle upgrades are uninteresting and cannot be seen graphically, and it all just falls flat. Polished execution, but brings nothing new to the table.
A combination of Tetris and old school balancing puzzles, but with care added to the order of weighs placed and the ability to remove some. More complicated than it looks. Well done.
Interesting concept, but no actual "game" included. There's more challenge involved in clicking the "next level" button than in actually solving each level.