Pressing ESC should close the program as there's no file menu to speak of.
Due to my programming skills the alignment of the collision boxes to the menu display is off and as you move left the less things it aligns with and it becomes difficult to click on. I wasn't able to adequately fix this bug on the first few releases and haven't actively worked on the program in a while.
I don't believe either issue is caused by Windows 11, but I have no way to test it on my end at this time.
Thanks for the feedback!