I did a search and I was surprised to see that no one had mentioned
Vampire Survivors yet.
[You must be logged in to view images. Log in or Register.]
The game is sort of like a cross between Bard swarm kiting and an 80's arcade game (except with graphics that weren't possible in the 80's). It's only $5 (on sale for $4 ATM), and the reviews on Steam are "Overwhelmingly Positive". Oh, and you play the entire game with just the d-pad.
It sounds so simple that it wouldn't be fun, but I've played 58 hours already and I'm not bored yet. If you want to turn your brain off and just run around killing endlessly (maybe while waiting for something in EQ to spawn), Vampire Survivors is definitely worth checking out.