Thank you for the feedback! We decided to not cap the any of the upgrades after realizing it was pretty fun to try to break the game like you said! Also it took quite a few upgrades to do so so might as well reward the player with some fun.
Took out the menu pausing for the continue menus because it felt too restrictive, but made the game pause when there was a decision to be made. Also good point about the hp being covered by upgrade menu, didn't catch that until it was too late.
Appreciate you leaving the positive feedback, thank you!