Can't say I know too much about marketing for online shops like Google Play, but this promotion seems extremely vague, to the point where I can't guess what the game is actually about. I don't mean to sound rude, though.
When it comes to marketing an entirely new game, you gotta make sure the selling point is upfront and explains what makes the game different from others. Look through other games available in stores to see what makes them stand out, and also what you can point out in your game that's different from the rest. You do already get a boost for game being free (but please don't use that as THE selling point)
A more interesting background picture would also help, but I don't know if that's just how the game actually looks so I'm not sure what exactly can you do about that.
Pretty much, just think of how that promotion would look if it were surrounded by dozens of other promotions for games on the same platforms.
When it comes to marketing an entirely new game, you gotta make sure the selling point is upfront and explains what makes the game different from others. Look through other games available in stores to see what makes them stand out, and also what you can point out in your game that's different from the rest. You do already get a boost for game being free (but please don't use that as THE selling point)
A more interesting background picture would also help, but I don't know if that's just how the game actually looks so I'm not sure what exactly can you do about that.
Pretty much, just think of how that promotion would look if it were surrounded by dozens of other promotions for games on the same platforms.