Thank you for your positive feedback :-)
Unfortunately, the lack of music in the game is due to the limitation of 512 kB RAM chip. If I were to introduce music during the game, the minimum requirements would automatically increase.
I encourage you to play the full version, which has 50 other levels in the story mode, and additionally DLC packs will be created for the game. There is also a DLC Maker written, in which everyone will be able to create their own 20 levels as a DLC pack with their own graphics and their own sounds in the game :-) The premiere of the full version will be on Christmas.