The Player

The player is a slime creature that has come in contact with a mask and gained sentience. As time passes, the player loses the amount of slime they have, as indicated by the bar on the side. To continue surviving, the player must collect more slime droplets by attacking and killing enemies or slime jars. If the player gets enough slime to fill the bar, the player will evolve into a new form.

As of the 1.1.1 update, the player can also obtain a sabre to massively increase their strength as a human (and maybe buff?), which will be lost if they lose too much slime.

Trivia

 * A fourth evolution was planned, but cancelled as it was felt it would make the player too strong