Actually you can brick it. You need to check recommendations from users in the note part of the app and never uninstall something you’re not sure about. Especially on Xiaomi and Huawei phones which are, from my experiences, the hardest to clean without breaking a phone.
Also, I don’t remember if it’s Huawei or Xiaomi but on phones from one of this brand, you need to remember the google account bound to the phone for do a factory reset on it.
Edit: Anyway this app is amazing and helps a lot. For some reasons, some apps won’t be uninstalled through this app, on some phones versions. In these cases, you can still use adb to uninstall it.