I like the game so far. I just downloaded it, so I will have to see how my son likes it. I like that you can choose how many notes get thrown at you. I like that you can turn the colors on and off as an aid. You can also choose left or right hand. I wouldn't mind having the rocks be a bit bigger and look more like notes because i have missed one since I went on to the next note. It is nice that for more advanced students, they include sharps and flats.
I have a recommendation on some more options you could add. For younger learners, you could have the keyboard with the letters. Also, make it slower. I am thinking about kids who are anywhere from 4-6. I have seen other places where they have the option to stretch out the piano keys. Oh, also they let you choose the range. I.e., middle c to high g. Also adding an option to make it look less flashy for kids who may be distracted by the glitter and the stars.
Thank you for developing such a nice game with such a potential to be all that I was looking for.