Thank you for your feedback! I probably wasn't clear enough in my description of game rules. The cage is hard to buy because players should go through feeding, upgrading the box, and eventually, at the end of a game, collecting enough money for the cage. When the box is broken, the player should use a sedative to return the Dino to the box. I will try to add that info to the game; hopefully that prevents confusion in the future.
Thank you for playing it!