While this game fits theme/challenge category perfectly, i cannot say the same about other categories. It is very simple, but i did not find the gameplay interesting. Just a simple "upgrade shop" would've made it more interesting, and adding some goal, like "reach $5000" would have given the gameplay some goal (if there is an ending, then i did not reach it lol). Still, the idea of different shapes being different fish types is a very interesting idea.