Game occasionally locked up on loading screens forcing me to kill the process. Only ever seemed to happen once per particular level.

Game played nearly perfectly with some very minor very occasional stuttering right up to the bird level. At the beginning of the first mission there the game would lock up my entire system and force me to reset. I've tried all manner of launcher options and several different versions of proton including GE's. No matter what I'll hard lock in the lobby shortly after the initial cutscene.