I couldn't stop smiling the whole time I was playing, I absolutely love this mechanic. I especially liked the massive spike in difficulty after winning in sort of a new game + fashion, nothing like spawning in and having 10+ towers aiming at you
I do wish there was music, and the laser seems to be missing sfx (might just be too quite with everything going on also) but that's really it in terms of critiques from me. Great game!