I've added a fullscreen button to my game, and I think the scaling is correct.

Just wondering if it's acceptable.

Also, the site has offset the border, and I'm not sure how to fix that.

I've noticed the same thing on Gamejolt.

https://newt.itch.io/oort

Ok aparently there was an export setting I wasn't aware of, so the border issue is fixed.

Its just upscaling, if the game was made in 64x64 then it's ok.

Yeah the viewport is 64x64.

Thanks.