Yeah really enjoyed that games, it had a good early access run and launched in a decent state. It has a unique way of doing things gameplay wise, it's quite pretty and the writing is surprisingly very amusing.
Regrettably co-op is nearly unplayable right now with there being no option to pause, save or reconnect. It's made especially worse when a basic run on the easiest difficulty takes 1~2 hours and desyncs of all kinds are very frequent (even when playing on the same network). There are also a bunch of bugs and missing features for multiplayer (like the inability to trade items). It's still a lot of fun though, and the devs are still releasing patches with current focus being on fixing multiplayer.
For the low price I highly recommend it, but if you plan on playing co-op be warned of the current issues.