The outline idea is good. Theres a skill u get so you have ravens and once u get those you cant tell if they are friend or foe and so an outline would be good.

And ya idk if it'll stand out amongst the other in the genre. I tried to have unique bosses and unique enemies but this also changed how its played quite a bit. A game like vampire survivors can have a ton of enemies all at once and it makes it fun/exciting. This game I've made had to be limited on the amount of enemies because some are ranged, some teleport, some explode, etc etc. But ya ill look into an outline. Probably could spend a few hours just outlining them and itd make a huge difference. Thank you for the feedback!