I tried playing the game on mobile but unfortunately I got stuck during the first level when I fell out of the map. I also noticed the default Unity background peeking into the game area. I would recommend using camera boundaries to prevent the game from showing areas that are unintended. I also want to point out that your instructions are incongruent with the actual gameplay experience. It said I can swipe to move left and right and tap to jump, but in the game I have to press buttons on the screen to move. You mentioned this was your first time, so don't be discouraged. Keep at it and build upon the wisdom you get every time you finish a project. Learn from everything you make!