Noticed this on Steam and only $10 right now, released few days ago. Does not appear to be a hardcore sub sim, but seems like it could be some fun. To be honest, might be nice to play something not so daunting:)
https://store.steampowered.com/app/1449630/Crash_Dive_2/
Graphics remind me of an old ww1 sub game.
I know what you mean about daunting. Sometimes it's nice just to turn off for a bit and watch some explosions.
I used to play the first game on my iPad. Not bad. Just don't expect Silent Hunter III.
Solid reviews @ Steam too...thanks for posting.