Thank you very much for the kind comment!
I haven't encountered the problem with the music so I would appreciate it if you could share some more details.
I just watched the video and decided to add a jump buffer, I updated the game but I haven't added much yet, just some moving enemies.
I am planning to fix jumping, fix the loss of previous level's gems after each reset, add enemies and add a losing screen on the next update.(in 2 days perhaps)
Thank you for the criticism and sharing the video as I learnt more things about game designing!