Step 1: Press windows key and R at the same time.

Step 2: Type in "%appdata%" in the box if you haven't.

Step 3: Look for PizzaTower_GM2

Step 4: Go into PizzaTower_GM2 and go into saves. saveData1.ini is your first save. The other 2 you already know.

Step 5: Go in the save data in which you killed Snotty.

Step 6: Find snotty="1.000000" and change the 1 into 0.

BOOM! Your recolored cheeseslime friend is back! Enjoy!