I couldn't press esc to get my cursor out of the game window, so I had to ctrl+tab to get out of the game. The game has a great atmosphere, but you should consider making it easy to chicken out of.
Thanks for the feedback! In theory, pressing escape should get you out of fullscreen and free your cursor. While hovering the game your cursor will be invisible but should be normal outside it! Could you elaborate further on the problem so I can fix it? Thanks!