Skautfold: Shrouded in Sanity

This game is great. Kind of short, but not GaaS. The entire series is pretty good. The sequel Usurper is a tad unbalanced, but very unique. The next game Into the Fray is... a run and gun isometric and is good, and then the newest one Moonless Knight takes the best aspects of this and Usurper, then improves them so it's fantastic.

Heads up, the original version of this game (released in 2016 as per the OP) was released separately as freeware in "Shrouded In Sanity: Freebirth" , links to Steam Store page. 

The paid-for version includes post-game updates like the multiple playable characters, boss rush, wave survival mode... none of which I would say are worth the entry fee. It's a neat little game, pretty rough around the edges but the compact level design built around a single checkpoint really carried it for me.

Good atmosphere and pacing. Not so good writing or characters.