Thanks for the kind words and feedback :)
We're aware of a build issue causing the game to automatically go fullscreen when you initially click into the window, but unfortunately removing the itch.io fullscreen button (which we have now done) doesn't prevent this from happening.
If you exit full screen and then click back into the game, it should function normally in a windowed view. This is the best we can suggest given that we are well past the submission time now.