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That's certainly reasonable to get the game working as intended before considering adding anything else. I hope you don't completely dismiss the idea of adding more challenges though. I don't think it would be gutting the design but rather building on your foundation.

In any case, let me know when you think you have it working the way you want, and I'll give it another test.

Version 1.1 is up and is designed to make the game more challenging and chaotic.   
The following changes were made


-  Asteroid Belt 1  now has less Zurg
 -  Asteroid Belts 2 and 3 now have slightly less Zurg
 -  All Asteroid Belts are more dense 
-  Your ship is now faster and more nimble 
-  Enemy ships are now faster and more nimble
 -  Enemy ships now spawn closer to the asteroid belts and will make contact with you faster
-  Helado gets even less fuel efficiency when above 4000 zurg. 
- The distance your ship and asteroids have from the effects of solar radiation is smaller.   Asteroids will be returned to to asteroid belt much faster.

Special thanks to Stand Off Software for their advice