Ravenfield is a pretty fun single-player FPS that keeps on expanding and becoming more interesting with each release. This latest release is especially fun.
Poly Universe is a pretty unique spin on the survival city-builder mix of genres, with multiple tiny planets that aren't much bigger than the colonists.
Project 5: Sightseer had me utterly hooked at the start, but after a while it fell a bit flat. Seems the developer really was hard at work to improve it dramatically as this latest update shows.
Is the title hyperbolic? I really don't think so. In my personal opinion, Dead Cells is easily one of the best games to come to Linux this year. It's also now on GOG.