Many small and big things changed/added.
New enemy: Hanger- drop from the top and explodes. Can be dangerous but sometimes helpful.
New enemy spawn curve.
After you kill all the enemies a new visual effect has been added and the game only continues after you drop down the hole so you can take your time to pick up every coin if you want.
New level after you complete a depth where it waits for your input before continuing to the next level so you can catch your breath between depths.
Continuing now picks up where you left of with the kill counter so you don't need to do it all over again on a single life.
The liquid at the bottom has been colored purple to make it visible when in pitch black.
You can now kill the wall crawlers but you will always take damage if you do.
Wall crawlers and hangers can kill other enemies if they happen to get too close.
Flying chompers now jiggle a bit to make them a bit more bug like.