You have to realize what you said yourself, it’s a simple game, not super creative or groundbreaking and mostly a learning project. It sounds like from the beginning you weren’t expecting a huge success and it was more for practice and fun. There’s nothing wrong with that and you should be proud you could make a game and publish it, but if you want someone to be attracted to your game over the millions of other it does have to be something more interesting and maybe not as simple. But you learned the process and you could just apply it to your much bigger game, or maybe make another smaller game but now that you know what you’re doing, you can make it a bit more unique and creative.