ahh sorry, i was too late, to read your post.
I guessed something like this. even if I close the browser window, C2?s music stops.
Who is the crosswalk team? And what are service features?
Is it even possible in any way, to let it run in the background, or are there any restrictions by apple/android to to block that? (I guess nearly every alert system games already contain, can be handled with server+ time)