Cute game! The controls were not set up correctly in the browser for me through, but I could just configure it correctly in the download version.
I'm not sure whether its legally ok to ship a whole emulator with your game though O.O
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The browser based version was a bit of a last minute addition :P. That is actually web GBA emulator configured to instantly load the ROM.
The emulator is released on the Mozilla Public License version 2.0 which explicitly allows redistribution (you can see that in LICENSE-MGBA.txt in the zip file :D).
Glad you liked it! Thanks for giving it a go.