Really interesting concept!
The pathfinding of the fish was cool and their behaviour did encourage me to try a few different strategies to score more points such as following around the angler fish or waiting for schools of fish to group together before rushing in to catch them all in one snap. I think one thing you could have done given some time might have been to give the player a scale to compare themselves against so maybe have medals if you score above certain thresholds. Overall I enjoyed the game though, good work!