Deep Rock Galactic: Survivor. +1million unit sold [plus more stats]

I'm not a DRG superfan and didn't expect to enjoy this, but the progression feels very solid and it's a lot of fun. Surprisingly addictive.

While it's not DRG, it feels extremely faithful to the original game and doesn't have that "too-vampire-survivorsish" feel that some of these games suffer from.

I can't really pin down what makes it so playable - my best guess is the pacing of the upgrades and the mix of the 4 classes feels like it's just right. Tunnelling through walls (and the mining speed upgrades) is also a particularly interesting mechanic.