Wow lots of levels to play! Picking up different guns and timing the dice roll were nice mechanics. I would've liked to see more diversity in the levels in the future but overall really solid game great job!
I'd personally like to implement unique floor objectives. like download something from a computer so you gotta defend it as waves of baddies come by to destroy it. that kind of thing.
but I just make the sfx and music. I can't code.... YET! :D