There's a foundation for a cool game here, with a bit more visual sprites and sound effects could spice the gameplay up, I think the music fits and is catchy and the main character, at least in the main menu as a concept looks really good. I didn't have much else to input, but I can see the effort. Good job!

This looks like simple "survivor" type of game, with cute characters. What is missing here is impact. Some effect, indication that enemy or player was hit. And maybe balancing between enemy spawning vs player healing.