I don't see any connections to the theme. I'd call that a poor connection 😎
Definitely can't call this "controller support" when the menus are not navigatable with it. Though it's so disadvantageous that using it is just a bad idea anyway (there's a reason why survivor-likes have auto aiming).
I really don't like how fast slimes can just straight up kill the player with no counterplay if they go on top of the player. I'd add some sort of knockback, or let the player shoot them to make this less unfair.
UI, art and their animations are cool and the sound design is spot on. I didn't really end up playing the game for long because I generally dislike survivor-likes, but I'm sure others have given more insight on the gameplay.