you press the spot where you want the creature to go (continuously) and head to the apples to gain biomass, where you can upgrade and evolve if you ate enough (I only designed 1 stage of evolution currently). Also, if you wait a bit before evolving, you will get more benifets, since its a percentage-based increase.
I made it using my creativity (and some books) and a snake game engine I made https://scratch.mit.edu/projects/1271158924/ (Copy and paste) Please star and heart. -If you get any ideas for future upgrades/evolutions, or want a new update, please comment them on below- P.S. I'll try to update it when it gets popular enough.