I just managed to get Space Game (the original Browserhax version) to compile as an RPX and successfully launch via Loadiine GX2. Still a little buggy, one of the most major being that it won't exit correctly.
I wish that i could show you a picture of it running within Cemu, but it seems that Cemu doesn't support OSScreen functions, and I have yet to see Decaf actually launch on my own machine.
Since it's the browserhax version, does that mean that it's working with those AVM Scaling functions as well? To exit, maybe try what the HBL version does? (just return 0). Interesting stuff