Oy, sorry to hear that - can you see if there's any crashlog .txt files in the game's folder? (might be inside the .app package here: MewnBase.app/Contents/Resources - can't remember exactly where they end up on macOS)
Viewing post in v0.54 - June 2022 Update comments
Just released an update to fix this problem https://cairn4.itch.io/mewnbase/devlog/394524/v0541-hotfix