on mobile app there are always some bugs, on the computer everything is normal

HI guys, I have a problem. Why always my game works perfectly on PC, but when I build apk
on my androids there are always some bugs. (for example, ground is white, not black, character
disappears after few seconds).

Do I have to change something in build settings?
My game is not demanding to run, its very simple(27mb).

 

any suggestion?

 

Not without more information. How are you debugging on the device? Please provide steps to reproduce with a brand new project.

 

So this is all I do when I make a game.
1. First I make a game (for example Doodle Jump replica)
2. I put the scenes in build settings, click switch platform to android
3. I changed the company name and product name and press build

This is my (default) settings https://imgur.com/a/uZS4SoC

So for example, I made three levels everything works perfectly, but on the phone character dissapear
after a few seconds.

I searched on the internet and found that Api compatibility Level can be the problem.
Also when I click build settings I get warning "
Failed getting available Android API levels. Make sure your android sdk tools version is 25 or higher and you have internet connection." (maybe that's a problem, but I think I have sdk, because Unity build my game but with some bugs)

 

Once again, how are you debugging on the device? Are you step debugging using Visual Studio, writing variable values to a UI text field (for example), or using Debug.Log and monitoring the Android logs? Please provide your logs https://forum.unity.com/threads/how-to-capturing-device-logs-on-android.528680/

 

The game works good in some phones but in some android there are bugs..how could I over come this issue

 

You'll want to debug the issue as described above. Use Debug.Log to write out your runtime variables which will appear in the device logs https://forum.unity.com/threads/how-to-capturing-device-logs-on-android.528680/ and https://forum.unity.com/threads/tips-for-new-unity-users.701864/#post-5057741