yup, game softlocks since after lvel 10 you got all the ugprades and level 11 then softlocks you in the upgrade screen :-/
Also how are you supposed to hit the demon king since he is always surrounded by tons of minions?
Thanks for the feedback! I was able to release a new version of the game today following the jam. It should address most of these issues, including the level 10 and 11 locks, no more enemies spawn when a boss is present, and a rapid fire upgrade for more variety and to make things more manageable. If you have any more feedback would love to hear it!