Enemies, Lives, Waves, and HUDs

Here's a quick update before I go get some food.
I only have red enemies right now but they're moving and chasing and doing all the correct enemy behaviors. I just need to make a parent object for enemies and then different colored children. The wave generator works but I need to make some sort of logic that dictates when it should be generating. This also needs a parent object so I can have a generator for each color.
I was having trouble with my HUD but I solved it quickly. It was just a z-order issue. The background bar for the HUD was covering the lives icon and numbers. However, it's fixed now and I've got a lives counter going but when you collide with an enemy the lives just continually count down. I need to make it so that when you lose a life you're position is reset and you're invincible for a short duration. I think a blinking sprite is a pretty universal indicator that you're invincible and I'll have to do that as well.
After this is all taken care of I'm going to make the powerups (guns of different colors) and have different colored enemies. Then it's rainbow meter and rainbow gun, a timer, menus(main, pause, win/lose screens), a top score tracker, and then the art and sound. See you in a bit with those scans I promised.