We just pushed a fix that takes fixes a hang (100% CPU) that was happening for some users on launch. It was a problem with how the game client was communicating with our servers (i.e., definitely a problem at our end)
Should be all good now. Please continue to let us know if you encounter weirdness - we are a small team... we try to test everything but sometimes things slip through, so it's incredibly valuable when players give us a heads up!
Minor update - addressing hang on launch
Source: Steam Community (opens in a new tab)