Great game, just one little bug
Blocks start collecting on the left above the screen, eventually stopping block flow. If you don't get enough blocks on the right to reach and shoot the lowest left block suspended in mid-air, you get trapped and fall below the bottom of the screen. Seems to be a problem starting around 400m.
Don't know if it's intended, but around 300m, flow on the left increases substantially. You have to keep knocking those blocks to level the field where you don't get trapped without a place on the right side to land.
Aside from that, I like that you don't have to climb falling blocks like Tetris'd just to keep above the bottom. Ability to shoot blocks to keep things level is a great addition.