YOU SHOULD USE YOUR LEFT AND RIGHT FINGERS FOR BETTER CONTROL.
Start from number 1, you have to evolve to the biggest number as you could with 5 given lives at first. Control your number to hit as much as possible the green numbers on the screen as you travel through the space. Avoid the gray number in circle and obstacles on the way. Each time you hit an obstacle or the gray number, your life will be minus 1.
Each green number has it own point as you hit them, the accummulated points will make you elvolve to bigger number. You can have magic such as "Level up" to evolve your number immediately or "x10 points" for ten times the point as you hit the green number, or the heart for more life.
The more you evolve, the bigger number you can hit, as long as the number in the cirle has the less value than your number, they are green and you can eat them up to take more point, and evolve more.
Image and sound in game from these source:
https://www.freepik.com/free-vector/colors-buttons-set_831742.htm#term=button&page=1&position=14
https://www.freepik.com/free-vector/buttons-for-music-player_957940.htm#term=button&page=1&position=36
https://www.freepik.com/free-vector/assorted-icons-set_571202.htm#term=home%20icon&page=1&position=14
https://www.freepik.com/free-vector/cute-animals-underwater-world-series_1531504.htm#term=fish&page=3&position=14
https://www.freepik.com/free-vector/colorful-brick-wall-texture_957410.htm#term=brick&page=1&position=34