Solid gameplay and Metal as hell presentation and sound \m/ è _ é
What's here is quite well made, and i like your upgrade system where you get to chose one and move on, i also find interesting how the theme is part of your setting as well with that giant clock in the arena, that actually becomes a stage hazard to sorta set the pace later on.
My only gripe is that with the default 6hp it's quite hard to pull of a 10 sec kill on the boss cause when it spawns during the fight you can really feel the difficulty spike, however having the option to choose your hp on the main menu is real nice to have i gotta say !
Regardless good job to the whole team, those enemy design look nice and that soundtrack is super sick ! :)