Rollerdrome
For those of you who aren't familiar with Rollerdrome, it's a really cool 3rd-person-shooter-meets-Tony- Hawk's-Pro-Skater, where instead of jumping over benches and police cars, you rollerskate around an arena 'catching air' and laying down some 'neat tricks' in order to earn ammo for your weapons, which in turn can be used to murder everyone.
It feels great, the shooting is solid and the combat has a level of challenge to it that I think makes the game pretty replayable. It looks super nice too, even on the smaller screen of the Steamdeck.