(CW: Transformation, minor mental change, potential violence, gore and death)
The dreams were real. You've been having odd visions; of rain and machines, death and rebirth.
When you next awoke, you were there. You were the creature you saw in your reflection in those dreams, the strange, cute being you knew as a slugcat.
Then, your stomach growled... The rains will come. You must get moving to survive.

Inspiration struck because of a bot by: @Amirealorfake

Note: I tried to faithfully represent Rain World tonally here. You can probably take it in whatever direction you like, though.
Since I love xenofiction, there may be other bots where you transform into other Rain World creatures later... Maybe. If I feel like it.

"What fate a slugcat?"