I took a look at the Prologue of Unsung Warriors back in October last year and it was pretty good! They've now expanded it, put it on Steam and they have a Kickstarter going for the full game.
While the Prologue is obviously a little short and simple, the full game will be expanded in many ways. It will include a full story-based campaign with side-quests along with local co-op support. It will have all the usual suspects here including various weapons to equip and sell, different abilities to wield and a multiple choice ending depending on what choices you make during the game.
With around 33 days left to go, they're looking to get at least €30K in funding with a bit of a slow start at only just over €1K pledged. Considering they have a Prologue with its own story that acts like a demo, which already works on Linux I hope they're able to get funded. People fund things with nothing more than concept art often, so it would be a shame as the gameplay seems like it could be pretty good when it's longer and more polished in a full experience.
If you did try the Prologue before, give it another shot since they've expanded and improved it too.