So I need to start programming the 3rd enemy into the level before I actually start putting everything in place. I origionally had two enemy ideas (which I didn't actually come up with):

Pogo Robot
Cannon

I decided basically to combine them into one enemy. This enemy will jump around and carry a bazooka.

Today begins my spring break, so I'll be getting alot more work done on the game. I think Level 4 will be finished by the end of next week, and I'll be well into Level 5.