Given this is a demo, this is a great game. good bosses, good game mechanics, and the auto mode is toggleable for manual boss fights.
would like to see more boss fights and balls in the full game if you do intend on making it, and i see there's still skills not developed yet too.
Overall peak incremental gameplay here until after level 10 with no reason for you to actually want to turn off auto mode unless you get tired of the level progress resetting for whatever reason.

After 10 is when it also just becomes a more basic incremental, but again given the fact this is a demo I'll forgive it.