That's a bummer to hear :( where you able to use the fullscreen mode? I wish I had more time to try to optimize the web experience, maybe I should have uploaded a windows build as well...
thanks for giving it a shot!
It was in full screen mode and it seems that I understood why it is so small. The full screen mode didn't scaled anything because (I guess) you didn't change default project settings so it just renders bigger part of level instead of scaling...