Well, looks like the melee soldiers in Arowar's strategy section don't even bother to attack me. Only the archers do. And after all the soldiers are killed and I enter Arowar Keep, there are no collisions set up. I can phase through walls, through doors, through everything. Only after the hopeless boss fight with Marian do I recover physicality.
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I admit that the evil route is a lot less tested than the good one. For the good route I had several people testing it, while for the evil route it was just me. There likely were some interactions I missed because I only played two or three evil playthroughs. Different people would make different choices and I couldn't cover them all.
I would love to go back to fix the bugs that are still there, but unfortunately I lost the development files a long time ago. For every fix I make I have to de-compile the game, take the broken parts into a 'clean' project. Then, once done, I have to overwrite files with the fixed versions hoping I don't break anything else, it's not unlikely some of these bugs appeared as a result of me doing just that.
At least the game is beatable. 1 of the bugs is present in any playthrough though. In Gaia's flashback if you save in the bathroom - you're not getting out. The cutscene activates after opening the door. After saving it resets for some reason, so after trying to open the door from the inside - Gaia gets in the water and doesn't get out even after the end of the cutscene. You can only change direction, but movement is impossible.