I had trouble running it as there were no instructions. Finally I managed to do this with following commands:
cd to/a/folder/where/the/Makefile/is
build/main
I found radial menu on keybinds Q, R, and Esc. Ones on Q and R functionality was not clear for me. I saw on screen many green "bushes" with red dots, that could be interpretated as berries. I guess the idea was to pick these berries. What I liked is the simplistic way that game design was implemented.