Collision event doesn't happen after I export the game.

So basically I followed a tutorial online by Brackeys and made a demo game. In the GameView on Unity 2018.3.0, if my Player collides with the Obstacle and slows down and the Level restarts but when I build the game and run it, it doesn't stop and just pushes through the Obstacles and goes to the next Level

Also my button at the end of the game doesn't shut down the application.

Please help!

 

Can't help you right now but just one little tip: Usually, Brackeys also provides the project as a download.

For a first step, maybe download the project provided by him and check if that works as it should or not? That way you could at least find out if it's an incompatibility problem with Unity 2018.3 or if you seem to have some differences in your project, which would help narrow down the problem.