I thing eating the mice and should get you a full bar. I agree with the other comments that the controls felt stiff.
I really liked the music, sfx, art, and concept. Nice application of the theme!
GMTK Game Jam 2024 » Entries » SNAKE but now it's a story of survival and motherhood in a post-apocalyptic world
The hunger bar was originally designed as more of an excuse to keep you going around the map collecting points instead of camping the eggs to protect them indefinitely. I feel like that extra layer of strategy would be removed if eating mice also relieved your hunger.
Thanks for checking the game out!