-I have made it so that your window size (and whether it is fullscreen or windowed) is saved every time you enter a new room or pause.  Then, your saved window settings are loaded every time you open the game.  It will only open in fullscreen the first time you play, as I find this preferable, but all subsequent times it will remember your preferences.

-I have also added alternate controls (arrow keys, Z, enter, etc.).

-I have made it so that if you press "escape" during a puzzle, it brings up the pause menu rather than quitting.  "Escape" now only closes the game when not doing a puzzle.

-I fixed an issue with missing corners on the ice tileset.

Thanks again to AncientDragonTiger for volunteering to bug test this!