I am in the same boat sort of. I would prefer not to have to release any apps. Just games on my web site, they play fine on mobiles anyway.
About GooglePlay, I have to check, I definitely need this. Back in Mochi ads days their leaderboards helped a lot ( I think ) There is an extra incentive to play more and beat other people's scores, especially with sports games, and 90% of mine are sports.
I know people were complaining about Google plugin in construct 2 because it was only working with web games and not mobiles, so I am under impression that they should work on everything.