It won’t take long for the monstrous Acid Worm to shoot up from below and destroy the middle platform, leaving you with only the far left and far right platforms to stand on. These two attacks are all Deo has in its bag of tricks, so just make sure that you’re running under its head and blasting the eye on its ascent to the top of the screen, and then avoiding those spikes, and you’ll be just fine. You can either avoid these OR shoot them down for some health and ammo.
Once Deorum’s head is back at the top of the screen, his tentacles will start to fire off little spikes in your direction.
Its attack is basically just the head lowering down and bonking you if you happen to be standing directly under him, so don’t do that! That being said, as soon as it starts to slither back up towards the top of the screen, run back so you’re directly under it and blast a missile right into its eye! You’ll only have time for one missile shot, so make it count! Deorum’s head will be in the middle of the screen, and if you didn’t already put it together, his eye is the weak spot we want to hit. You’ll be trapped in a small arena, with Deorum’s big smelly tentacles on the left and right boxing you in.