I'm really glad to see someone using the math definition of mode! And I like how it resulted in a multi-layered use of the theme (use different modes of vision to find the mode). Also just a silly (in a positive way) concept that honestly could work as a kids cartoon or comic series. The detective and his shrimp side-kick solving crimes, haha!
That said the gameplay itself I found lacking, mostly in the feedback department. No idea how much time I had, how much time a wrong answer would cost me, and the sound effect for getting the wrong answer sounds like a correct answer type sound. When I got a correct answer, it took me a sec to realize I had actually gotten a correct answer since it didn't tell me I did. I just worried that I accidently insta-closed the defeat screen or something when I popped back to the main menu.
Music was pleasant and present, both of which are high marks for a jam game. And while I'm not sure about anyone else, for me I'd say you had a good font choice for the numbers. I could read them quickly and easily even in shrimp mode.
Overall, good job!