The devs knows what they are doing, the animations are clean and the design is solid, each mechanic feels great and the controls are tight, the only nuisance might be the X traps that can spawn directly beneath you and the weird recovery time you get after getting hit, other than that its amazing.
Theme, there is only one boss and that one changes and has more powers. But wait, isnt that just a boss rush game where you just dont have to go to the next room? You might ask. Yes. Yes it is.
Originality, the spin on the theme is original, but its a bit meaningless, its not different than a boss with several stages at the end of any other top down shooter.
Final thoughts: I may sound harsh at the end, but let me say this, its one of the best games in the jam, it plays well it handles excellent and its super fun. It would be a top game in any jam and thats the point, it doesnt speak to this one specifically.