Coming here because I have no seen an actual answer to getting to the second floor of Arka.
In my game: I have 1million GC, I told Garth I did not want to be a slave. There have been no other options that I can tell for me to get to the 2nd floor.
EDIT: I noticed my game wasn't updating properly through itch so I just re-did it. Now my game crashes if I choose Accept the Deal from Garth.
Viewing post in Lust Odyssey (NSFW Visual Novel) comments
Once you accept the terms, you can let the Ship's AI hack into the AI of the limousine and preemptively exit the stage. Or don't. Likely doesn't make a huge difference, because *spoiler*. I agreed to the hacking btw.
I'm sorry you encountered game breaking bugs. I also encountered one but since I save much too often I just reloaded the previous save. In my case it was a softlock... Honestly, I'm not even surprised there are this many bugs considering how complex the game is with all it's choices.