Fresh Hell

Controls:

W – Thrust (uses energy)
Mouse – Steer
R – Repair rocket (uses energy)
Spacebar – Harvest energy from planet
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The rocket obeys the laws of physics; it will keep moving until you flip the rocket around and apply thrust in the opposite direction. All planets have gravity. Every planet has an energy source available to harvest, though some are a little… unconventional.
Planet positions are randomised with each run. 

Known issues: 
Planets are sometimes generated in a way that they overlap
Rocket sometimes misbehaves when landing on an uneven surface (add any more you know of here)

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Inspired by Last Horizon and Outer Wilds
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Downloading is recommended for less lag.
Fullscreen recommended for web version.