Hi. Fullscreen and scaling is very WIP. I actually considered making the game fullscreen by default so I could get people to test it, but I didn't want people to get crashes (like you did). As far as I tested it it didn't have any major problems, but I only tested it on my resolution, so I'll have to look at it again. Thanks for the report. I'm also considering adding a tutorial sort of thing for the next DD so hopefully the game will be easier to get into. Cheers!