All ages,
Especially in the last years, there's so much game types, that any one could find a game to expend some time.
But, every game has its own target audience.
People like me who were born along with the games in the 80's / 90's are the ones who take it more nostalgically, jumping in games that has an "oldschool" feeling.
Nowadays the visual appeal has a lot of weight, before it was the pure gameplay, and I think the industry loses a little of above 30 year's group, because visual is not everything for us who grew up playing fun things over top graphics.
I'm really enjoying HMM because of that mix, 4 me it's the same feeling I had when I played Rock`n Roll Racing back. Nostalgic of the past with elements of today's games, like, upgrades, moba, etc.
It's great and have a lot of potential.