I can't shoot at all, because spacebar scrolls my page down. Nice music, though.

The movement could definitely use some work (bit slow, and maybe reconsider tank controls), and there should be a bit more feedback when you kill an enemy. But I like the top-down 3D look, and I kind of love the music.

the arrow keys move the browser window, fix this if possible

The turning is far too slow. The visuals are also unappealing. the hitboxes felt too small for the bullets and enemies. But aside from that, there is potential here.