Thank you so much for taking the time to write such kind words! I really appreciate it <3 It means the world to me, and I'm super happy that you enjoyed playing the game :3
You are correct that there are multiple endings for the ??? route. You'll know when you've found the "true" ending, as the credits will play and you'll unlock an extras section with some bonus content :D
Unfortunately, I don't think it will be possible for me to release anything on Linux unless I use something other than Tyranobuilder to make the game, because it seems at the moment there is no support in Tyrano to release for Linux :( Sorry about that, it sucks I know >.<