Great game but a couple problems – Horizon Chase Review

I absolutely love this game. It has great controls great levels great everything. The only thing i don't like bout the gameplay is bumping. When I hit someone they speed up and I slow down makes sense. But if someone hits me I slow down and they catch up. That bugs me. But why I rated this two stars is because there's like nothing to play. There is four levels. When I push to see if there is anything left. It says buy it. Ok how much would it be. I click buy and it tell me to put in my Apple ID password. Well how much is the thing. That's my complaints.
Review by Garrett vs games on Horizon Chase.