This is so cute! I raised a couple rats as a kid so this hit close to home :) I think the only issue I had was that I felt a little too busy a lot of the time, like there was never any moment (except for maybe during the first few minutes) where I felt like I had to just sit there and reap the rewards of building up my rat empire. I always had the money to keep pushing forward, so I always felt as if I needed to be doing so, or else my goopy goblin gamer brain would yell at me for wasting time hahaha. Maybe making the rat shop's costs steadily increase over time, or even adding some sort of cost for rerolling at the shop could help as a money sink too (I found pretty quickly that I was just constantly rerolling until a blue rat came up, then I would buy it and immediately continue rerolling). Other than that, I loved this. The detail with the building slowly upgrading over time was a great touch, and a really good reminder of the progress you've made, the music and sound design were adorable and the art was fantastic. Great job!