Steam clearly reports
ONLINE CO OP
There appears to be no single player mode.. and requires logging into servers, so it's highly likely most things of importance are server sided. also this game is vaporware, and has almost 100% super negative feedback.. likely never will be completed or will be a dead game.. and is only in ALPHA...
Also there appears to be console commands for this early access title?
* Updated game trainers and cheats daily
* Get notified when new cheats are added
* Request which games get new trainers
* Priority support with any problem