Haha what a great idea :D Tetris + Shooter really seems incompatible when you hear it, but the way you combined it is very clever!

I like the idea! Some of the tuning could use work though. I noticed that enemies would sometimes not spawn for several seconds at a time, and then have many on screen at once. Enemy waves are one thing, but the time between enemy spawns and the amount of enemies that spawned seemed odd, to the point where I thought it might have been a bug triggered by restarting the game. I do like the way that you had to balance the line matching and shooting, although I think it would be helpful if the playfield for shooting was just a bit larger.

Cool idea, well-executed. It got really easy one time when I had a lone red plus floating slowly around - probably could have played that as tetris indefinitely. And then it got really hard a few levels in. Nice job, creative idea.

Wow, Robotron and Tetris, two of my all time favorite games!

I think to truly have a Robotron feel, this game needs unlimited ammo. But then you would need to have an excuse to clear lines. I didn't notice, but if clearing lines replenishes your ammo, then maybe that's all it needs. I thought it was a bit hard to control the piece when I was close to the stack of blocks. As soon as I got too close, I'd lock the block down, where I didn't want it. If you could work that out so that it felt better, I think this would be a great game.