Hey don't lose motivation! It's part of the process!
This usually means the app is crashing or hanging during startup, even if you didn’t add a loading screen.
First thing I would check is the device log:
adb logcat (maybe you can even grep your package name)
or use MQDH logs and look for red errors when launching the app.
Common causes are:
- Missing scene in Build Settings
- Wrong startup scene
- NullReferenceException on launch
- Platform/SDK initialization failing
- Too many heavy assets loading at once
If this happens in all projects, I would also try making a brand new empty scene with only a cube and camera rig. If that also gets stuck, the issue is likely your build/settings setup, not your game logic.
Do your best! I'm sure you'll get it working