I recently created a hangout game, but it’s getting no players at all?
I try to update the game pretty frequently (atleast two-three times a week), and in my opinion, the game looks good, and the icon / thumbnail is catchy.
The game has things to do even when no one else is around (find secret items)
Heres the game, if anyone would like to take a look.
Any constructive critism is appreciated! 
it is not getting players because it is a hangout game. quite simple. icon is not very appealing imo
it is not keeping players because theres not much to do it is just a small forest or something with some stuff to find that is it
edit: i forgot to mention you need to advertise via sponsoring or social media
Hangout games as a whole are hard top get and retain players, they either have to go viral or do a lot of advertising. The lobby could also use some more detail, not with the scenery but with things to do/look at that stick out.
All in all, looks pretty solid. Keep your head up and keep going!