That's very strange. It's supposed to work on all aspect ratios. What browser and browser version are you using?
Viewing post in A Game of Jam jam comments
Thank you for your feedback!
I agree, I should change the diagonal movement speed. I will do that! Thank you for pointing that out! I completely missed that!
As for the black screen, it seems like the game is incompatible with Firefox (and probably IE too). I know what the issue is, but I don't have enough time to fix it at the moment.