I really liked the mini games. They reminded me of games I've played a lot in the past, like Human Benchmark and Type Racer. It is also a nice touch that the harder difficulties are not all just "same but faster" - for example, in the Disco Fish, the letters can suddenly spin the opposite direction and spawn closer to the beam.
The silliness of the fish names and drawings was also amusing.
I ended up always skipping Ninja Fish because it is too hard/random for me. Sometimes the orb is at the same position as 1-2 other orbs, and then they all change looks and directions simultaneously, making it practically impossible to know which one I needed to track. This feels unfair. Perhaps it would be more fair if the change of looks and directions happened at different times.
But overall I had fun playing the game, it also fits perfectly with the theme. Well done.