Great pico8 game as usual :) remind me of your previous game (Gob) mixed with (Metrash). My only problem is because there is no map and the game is always drive the sense of exploration, I never go back and explore and if feels more of one direction. I don't know if that was intended feeling or not but I always feel lost after awhile and can't find more cannon heads or food. Maybe you should consider having more of these items easy to find but make the cannons durable (go out after certain amount of charges).
Overall great game :)