Absolutely a fault of the latest update, I was playing it with a custom resolution before the update and it stopped working just after. Luckily, it still works in legacy mode, but still...fuck Win10.
That was actually fixed on the new version of Windows 10, you have to manually update it I believe (idk why)
Seriously? Thanks, I will try it (Now that I think about it, I recently downloaded another famous Lisa fangame, and the legacy version doesn't work while the new version does so probaly it automatically updated, I guess...)