You basically have 2 phases, once you find all of the snails from the black and white part, it switches to a coloured phase. The coloured one was a bit hard since some snails were like hidden patterns.

Also, there's a giraffe with tits.

You find 100 snails. You click them. That's pretty much it.
It also has some pretty annoying music and no options to change the volume so that's... right.