This Seeking Tech guide will show you how to beat the Crumble Rumble 4 stage in Astro Bot.
Use the following video as a reference:
It is important to note that there is a trampoline hidden on the top right corner of the battlefield. So, make sure you keep that location in mind.
For the first step, you should take out the three electric enemies. Make sure you give yourself a safe landing spot when you use your laser legs. Most of the flying enemies will end up hurting themselves, so you can just ignore them.
When the alien shows up, you need to carefully break off the floor on the corner with the trampoline. You can then jump on the trampoline to give yourself enough height to deal with the alien and any remaining flying enemies.