Thanks for your valuable feedback! I tried to replicate the problem, and I found that if you have the scale and layout settings in windows set to anything higher than 100%, the game window would not fit the screen. I have uploaded a new version that fixes this issue. I have also added a feature where you can press the + and - keys to change the window scaling. I hope this will fix your issue! A bit of warning, though - setting the game window to a scale of 1 (256x240 size) while having screen mode set to 1 will cause ugly graphical artefacts.