Thanks for playing!
Getting that border boundary right was harder than it should be, so as a follow-up I'll be tweaking it some more. Wish Unity made it easier. In GMS2 it was a cinch. Regarding the sprite size, definitely something I need to keep playing with. I personally dislike tiny sprites since I want the artwork to be appreciated, unless the small art style is still crunchy. Just need to keep experimenting. Was it any better with a fullscreen? I find getting the HTML and fullscreen settings right kinda mess with the scale too.