It's really slow on my LG Quantum. @ First I thought it did not work, but my zelda rom must be corrupt ( or unsupported here ). It played super mario bro's just fine, just slow & no sound at all.
I dl'd it to my laptop, chevron-unlock ( 'cause my phone locks every 5 minutes or so ), tom's xap install. Put in the url to my nes rom, hit download, hit play & it plays.
Note: can ONLY be played in portrait mode. In landscape mode, the controller takes up half the screen, so you don't see much of the game screen.
recommendation: allow users to map buttons to controls in-game. ie, my Quantum has a nice slide-out keyboard so I wouldn't need the dodgy on-screen controller.