I hate this game in a good way.

You can add a time limit to the brake key to prevent cheating.

Or you can add a time limit for each biome to create a balance between braking and "oh my god how not to die and be on time?!!"

I really enjoyed the simplicity and clarity of your design for the game down to the fade out transition when you crashed. It looks great and was easy to understand what was happening.

Beautiful and fun.  Loved the metered sense of forward progression.  Super rewarding to get further and further, and I didn't really get frustrated at any point.  Got better about not needing the break.

Didn't you make this in like half the time or something?  Great work!

Great game! Did you consider making the rocket slower by default, then adding a key to boost instead? I played for a while before seeing the note about the brake key. :)