Aerial planets mainly contain gas with some chunks of solid rocks floating about. Therefor you are able to move in any direction, though anything than slowly floating down costs some of your fuel. You cannot drill upwards as this is blocked by the propellor, only sideways and down.
The higher you go the stronger the winds will get and the more you are pushed to the ground. You will not directly be killed from going too high or being too high, but you will slow down flying against strong winds using lots of fuel to advance mere inches until you literally can't ascend any more or die from lack of fuel. So when going as high as you can keep a very close eye on your fuel amount and try to stay on solid ground as often as possible.
Available materials: Edit
|Minerals||Altitude||most common climate|
|Trophies||most common climate|
All Trophies can be found at any altitude.
|Plasma (from Geysers)||0-150m|
|Unstable Isotopes (from Ozone)||150-250m|