Based very loosely on the 'When Day Breaks' SCP-001. Made for MMD Spookyjam 2019.
On days when the moon isn't there to regulate it, the sun will mutate all mobs!
(That is, on days when the following night is a new moon, around a quarter of mobs exposed to sunlight will mutate into 'amalgamations', which will over time grow into huge blobs, and pumpkins will grow into slime-like creatures. Players will be hurt, and turned into amalgamations upon death.)