It is 100% possible to change the size of your html5 arcade game!
Alright this isn't a perfect option, but for some it may work as a solution.
Check out this arcade title that I have resized.
simply use the css available within this post below, it seems to be compatible with all latest browser versions.
simple add a style=" zoom: 2.75;
-moz-transform-origin: 0 0;
-o-transform-origin: 0 0;
-webkit-transform-origin: 0 0;"
within the > brackets and change the scale numbers to suit your needs.
More information can be found:
As you can see there is a bit of image pixelization, but maybe that is due in part to the assets of the project?
Not sure. But it's a pretty fun trick so play around with it.