一家游戏公司刚刚发布了一款新应用，他们希望将工作重点放在首发阶段。 当一款应用首次发布时，对于发布该应用的企业而言，哪项指标最为重要？

For a newly launched app, the primary focus is on establishing a user base. Therefore, the number of new users and installations are the most critical metrics. These metrics directly indicate the initial adoption and reach of the app, which is essential for early growth and market penetration. Website traffic is less relevant for an app launch as the goal is app downloads, not website visits. User reviews, while important for long-term reputation, are typically scarce immediately after launch and don't reflect initial adoption. App-in-app actions are important for engagement and monetization, but they are secondary to acquiring users in the first place. Without installations, there can be no in-app actions.