This tutorial will show you an easy way to beat Crumble Rumble 5 in Astro Bot.
For this method, you simply need to stand on the outer rim. The volcano enemy should take itself and most of the screw enemies out. In rare instances where a rock may hit you, simply move out of the way while staying on the outer rim.
Once the volcano enemy falls off, finish the rest of the enemies and then jump to the center to complete this stage.