Thanks for the suggestion, I have added full-screen option. The crystal served as XP. It was originally designed to let you choose stats when levelling up, see those strange icons? But I ran out of time and changed to implicit stats upgrade. I agree the ability count is hard to notice. The UI was added at the very last minute, sorry for the bad experience. I may keep updating the prototype after the jam, there are a bunch of stuffs I want to add to the game.