This looks great! It's in early access at the moment on Steam, and it's apparently a bit rough around the edges, but I have no doubt it'll be really good when it's finished. It's from the same devs that made the Ori games.
What I really like is that it has drop-in/drop-out online co-op for up to 4 people, so you can play through the game with friends or go solo.
No release date has been set for the full launch.