What is the fine-grained topic of the following text: At 99 cents, Asphalt 8: Airborne is usually a extremely polished racing with loads of articles, but its pacing is definitely stunted by intense gating that pushes too hard toward its in-app buys. Only return the topic.
Review and criticism of the mobile game 'Asphalt 8: Airborne' regarding its in-app purchases.