Very unique and creative idea! I like the progression and the idea that rent continually increases forces you to generate rooms which would earn you coins at the cost of having more enemies to battle. I felt the game started a bit too easy and repetitive, but as it kept going it felt a bit better, so maybe a slightly more steep difficulty curve for the first few minutes would be a good change. I also enjoyed the graphics quite a bit, and the sound effects also feel pretty good. Overall a great entry, great job!