Very enjoyable
I hope there is a second version coming as there are a few things that could only make this even better imo.
Ringed Planets: hit the ring as it rotates and you are taken out
Space Stations to dock to
Solar Flares, but only if you have a one time booster to escape them
A Solar Sail vehicle (escapes Solar Flares automatically)
Planets with moons in orbit around them
A higher Challenge level where you must remain on a planet for one full rotation to fully replenish fuel and O2