Thanks for playing the game!
Yes, keyboard-only controls was one of the design choices and mouse support was added mostly for convenience. The only two things you cannot do with just a keyboard is quick save/load :)
I’m glad that you regeared for different enemies, it might feel tedious with a lot of UI in the way, but you end up with a stronger build, which can two-three-shot enemies in most of the cases.
Quick load works only inside the session, hence “quick” in the name. We didn’t manage a complete save system and with a web build I don’t even know where to start with that (maybe there’s some functionality on itch which provides you with some storage or maybe cookies can be enough?)