We have had some people report that their browsers are not framing the game correctly. in rare cases it makes the game 100% not viewable in others it is just smaller. Most people see it just right so we are still looking into the issue. It doesn't seem like a browser or OS issue since the issue has been reported in all and also reported as working in all. I can send you a standalone build if you tell me your OS
I wish we saw the issue before the end of the Jam but it worked on every computer it was played on by the team and the people we sent it to for feedback throughout the week