I LOVE the gamplay on this one.
Arena shooters are a long-time favorite of mine and this one feels quite snappy and fun. Very clever interplay between offense/defense. I might suggest to tweak the balance a bit to help the player feel powerful from time to time rather than overwhelmed, but I know thats a tricky balacing act.
In any case, great work on this one. It's a highlight of the jam for me.