I've played this a few times and love the idea of a free-roam, open world sandbox game with Back to the Future mechanics. The game is still early access, but the premise is outstanding and it's a fun game to experiment with.
They diverge quite a bit from straight Back to the Future. The car is similar but it's just the plot device, and the relationship between the player and the "Doc Brown" character is pretty different. They're colleagues working on a machine and the player is sent forward in time... Open world from there. I'll get a proper review up with a video and stuff, it's a lot of fun.