You'd be surprised how crappy games with worse names then graal online have 5-50k downloads.
And graalonline, Fact it has online in its name, will get people to at least look at it, online is probably one of the most used words in the research bar for apps on any platform/web.
Well about the "graal" part...not so much popular/usefull, shoulda have been GraalOnlineRPG...
Other then that, give it 1-2 months, you'll see, we'll have some downloads.