Why is my build working on Unity but doesn't work on android?

i am working on a project. it has been going fine. i am at the last stages of polishing my game. all is well when i am testing it on UNITY, however, when i make a build and hit play it doesn’t run my scripts on that particular scene. to make things worst, it doesn’t report any error on my development build. it’s like it doesn’t respond at all. am i missing something?

Check it out on blue stacks first, so that you make sure that your phone is not the problem.