My bad, I should have investigated the game carefully. English is not my native language, and I didn't even know what "portal" means.
Anyways thanks for your help :)
I appriciate that you released the android version for free. I enjoyed it and ended up buying the desktop version today. I also appriciate that this game is pretty lightweight since I don't have high-spec devices.
Fun game! But one thing I've been annoyed is that the exit. I accidentally touched it many times. I'd be happy if there is a dialog box before a session actually exits.