You should explain in the in-game instructions somewhere that you can use the dead fish to kill other enemies...
I had to read the medal descriptions to find out, haha
(It helps a lot knowing that you can use something as a weapon)
The only problem I have is that it seems to lag to the point where I don't want to play anymore after I "beat the game" and it tells me to see how long I can last.
Great game tho otherwise!
Mockery of Event IRL