The best top-down roguelike shooter, and probably my favorite ost ever.

+Immersive as ♥♥♥♥ (worth it just for this, imo)
+Looks fantastic most of the time
+Devs are very cool

-Early access (rough edges, incomplete content, minimal content, crashes occasionally)

If you were avoiding this game because of the water system, that is now gone, so give it another look.

Helldivers never die!

Free
Valeim+Risk of Rain but then put up for adoption then raised by the TABG guys

Awesome

You start playing because hey, its free and seems to have a lot of players.
You find the action is fun, the grind is (often) rewarding, and there is a lot of things to do, so you stick around.
You eventually start to realize the story of the game (which starts out non-existent) is far more interesting than you ever thought it could be, so you keep playing.
Soon you are trying to collect all the things, optimize the things, and cannot leave because you want to experience what happens next.
In short: It starts off seeming pretty shallow, but rewards your time with a surprising and deep experience.