You don't see many squad-based rpgs these days, especially not set in a post-apocalyptic world. Fatshark released Krater for PC three days ago and the response has been pretty good so far. Currently the game is only singleplayer, but they are planning to add co-op within the next month and player versus player sometime after that. Sure there are bugs and a few problems, but take a look at my list below and see how everything stacks up. I should note that many bugs have been fixed already, I've seen two patches today alone and the developers seem pretty on top of it.
I've only played Krater about five hours so far, to my dismay, but let me explain a little bit about the RPG aspect of the game. Your squad has three members, but you recruit others and switch them. There only four classes, each of which have two main abilities, and each character levels up like a normal rpg. However, leveling up doesn't increase your stats or anything typical like that. The main purpose of leveling up is to unlock more slots for upgrades and implants. You strengthen your characters by placing implants that increase stamina, strength, focus, intelligence or other attributes. You can also place upgrades onto abilities that make them do something every time you use them, like heal more for the medic class, do more damage for the bruiser or increase the focus of the tech based class.