I don't think it can be caused solely by the mod itself, but most likely clash between my mod and another one. Red screen issue was already reported on reddit, but the reason was a light installed over a door using some other mod to allow non-vanilla placements for items. So there are multiple possible reasons and it could be that removing some other mod could resolve the problem as well. Probably it can be fixed from within my mod, but to do that I need to know much more than just "screen goes red".

As for wandering colonists - do you have any mods which modify stun mechanics in any way? Because my mod stuns all pawns for 10 seconds, and if you have something non-vanilla which gives you stun immunity or whatever - it could be the reason that the pawn is moving after takeoff.

This is my mod list:
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3556816503
This is how my ship looked like when the bugs were happening:
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3556817199