Into the Breach
Might contain spoilers.
I’ve played this one before (briefly, around when I played XCOM 2). The mechanics are solid and well designed. The music is so good I still listen to the score. The story is simple and straightforward. The mechs are interesting.
I wish I could enjoy the free Advanced Edition update, which looks like a worthwhile addition, but I inhabit a different world from the commenters complaining about the game being too easy. It’s just too hard for me. I’ve tried many times and only once reached the last island before making a fatal mistake.