Free:

• Disfigure: amazing aesthetic and sound effects, you can make some broken builds
• Holocure: cute and fun, based on the Hololive vtubers but you don't have to know about them, the game is very fun by itself with a ton to unlock

Paid:

• Soulstone Survivors: the scaling on this game is absurd, and how deep you can make builds taking into account the different statuses the skills inflict
• Megabonk: recently released, it's like Risk of Rain, a bit hard for me but still super fun
• Halls of Torment: reminds me of Diablo 2, with pixelated 3d visuals, has a slower meta progression