Here are all tools I use to figure out what is going on with my projects. If you have any further question about it drop me a message.
Unity Analytics is build into some of my games. It sends me events that happens in game, like where the player dies, when a level is completed and so on. The data is aggregated and used for balancing and patches. Crash reports are also collected. A random generated ID is used to keep track of players between sessions. Read more on Unity Analytics here.
I use Google Analytics on my pages and store pages. In most cases I look at referral links. Data is kept for 36 months.