This day is going great. I feel like I could finish a satisfying game even today. So far minimum requirement for my game will be setting up a starting screen to explain the story, making the kill-condition more than just a print ‘died!’ in console and making the game replayable without restart. Everything else is in. Better graphics, more features, sound and music is optional for tomorrow.
After adding more cages and enforcing hunger and desperation on the player it looks like that: