Sure! They're all very simple.

The pumpkins have a random curve speed, either -1, 0, or 1. Then the walk towards you and to the left/right depending on their curve.

Little goo monsters are the same, except they curve from -2 to 2.

Crows pick a random amount of  times to hop in random directions, then charge and dash towards the player.

Cobs walk directly away from the player, until they are far enough away. Then they start charging and shooting.

All the basic monsters except the little goo(s) push away from each other with a force relative to their distance apart, so that they don't overlap.

Bosses just go through a looping track of 3-4 states, which all have totally separate movement targets and attack patterns.