Love the artwork and really like the stress/money tradeoff. Skipping very important part in a ‘tower defense’ game so i like that it is in this one. I also love the animation of the ferrets. The only thing I would love to see is different kind of ferrets might prefer different kind of food, or special enemies in waves, or upgradable tables. Just to make it a bit more dynamic. I felt personally after like 15 waves, yes it gets harder but the experience you get with the game does not change.
Awesome concept and hope you keep making it bigger :D