Hello! Thank you for playing! That's understandable, I hadn't gotten a chance to update the itch page until around now.
Basically, there are random holes in the ground scattered around the map. Robot bugs spawn from these points which drop parts you can use to craft turrets to fight even more bugs, and they also give you "dna", which you can spend to mutate your turtle.
I'm glad you enjoyed the controls and the turtle, and thank you for giving it a chance even without instructions!