I like the idea here, seems like a fun little game. As others have said, a little bit more range on the attacks would be nice. Also seems like you can still be hit by enemies after you defeat them. I blew up that first sweeper bot in the lab while holding left down and apparently got clipped by a hitbox on the way through.
Only other complaint I have is that you should go through and have the artist(s) do a pass over and make sure all your art is the same pixel resolution. Obviously for the jam it's understandable that it might not be the same, but this is more for after the jam. :p