I have looked into a web build a bit and I do not really think that it is possible. Python cannot be compiled due to various reasons and the supposed "web builds" are just some sort of web emulations. I could include a link to one of these if you like, but the ones I have tried are very laggy.
You should be able to run main.py from the source code if you have pygame installed. I do not currently have a Linux machine, so I cannot make a Linux build. Sorry.
From the error message, the problem is that you do not have pygame version 2 or above. The pygame.SCALED flag is something that was not in previous pygame versions.
