The rocket launcher is almost killing the enemies. I don't see a point in making it overpowered because you can shoot all the way across the game area with it. I think that would make the game too easy. A shoot from any other weapon (even pistol) is enough to finish of the enemy. Btw. I just checked the rocket launcher damage. It is between 80 and 100, so you can oneshot enemies with it ;)
And yes the enemies have different health. At least the purple one only has 80 (which makes him one-shot-able with the rocket launcher). The other enemies have 100 health (one-shot with some luck) :D
Let's stop the discussion here. I will take your points into consideration, but that's the best we could come up with in the 48h ;) We planned some additional mechanics and power ups, which didn't make it into the game.