This is a fun game - it may be simple but it feels very complete, which is a real achievement for a jam game. Some music or ambient sound would help polish it up, as would a little "Mwa-ha-ha!" or something when you click each demon (perhaps unique to that demon)? I second the idea that a leaderboard would be nice too: I can always try and beat a personal best (though I note the highscore on the title screen doesn't actually record it for me), but it would be great to compete with other people and get an idea what's considered a "good" score overall.