Not sure if there are any Girls' Frontline fans here but RC is a turn based strategy (well, tactics) game set in the same universe.
Haven't played much yet but it's pretty fun so far - graphically looks like a mix of improved GFL and XCOM, gameplay is easy to grasp and looks like it might be a bit of a challenge when aiming for all bonus objectives on higher difficulties.
Also works perfectly with proton!
Now to test it with Deck...
Update on Deck:
Game runs pretty great, with two caveats:
UI during combat sections (mostly dialog) is a bit small
videos in tutorial prompts don't show up at all
game defaulted to KB+M controls scheme, had to change to gamepad
No other issues so far, plays great with normal gamepad preset. Battery life is also rather nice (~4 hours in my case).