I like your level designs, sprites, and the music. I would like some sort of challenge like a way to fail the game. Also the game goes offscreen in full screen. Try a 16:9 ratio such as 1024 x 576 or 1280 x 720 in your Unity player settings. To loop the music try this:
This may help too plugin: https://seansleblanc.itch.io/better-minimal-webgl-template