Yeah didn't really have time for proper tutorial :s
Basically blocks spawn each 4 steps when you are human and you have to doge them. There is 15 second timer after which human dies and you summon spider. Spider eats animals, but after it eats first animal it turns into it's that color and if you eat another color you die. Human corpse resets color to neutral. And once you eat first animal you can't step on empty block anymore. When spider dies it leaves cobweb that can't be interacted with and you become human again.
Basically that's it but definitely could have explained it better ingame. Thanks for trying it out though!