I'm looking into the bug you mentioned, and it look like it only occurs during full screen mode. I don't have a whole bunch of computers with different screen sizes to test this on, but I do believe that is the issue. I should have tested full-screen mode to make sure it works properly or just not allowed full-screen mode at all. I'm sorry you had to deal with that issue.
I'm glad you still had fun with the game, and I'm really glad you like the art! Thank you for your feedback!