It's a fun demo with i think a lot going on but its still to the nature of the demo not so obvious yet.
Some thoughts:
- Mining is fun
- I understood that i could take damage and it made sense
- I ran out of ammunition quite fast having only harvested two crystals. That was not ideal for me
- Then I didn't know what to do. The mothership came only later and I was literally flying around without a goal
- Having a clear goal in the UI would help "mine as much...or whatever"
- The two crystals only gave $2 which was a downer looking at the cool stuff I could bye
- I didn't understand how to refill my ammunition
So...its fun...keep working and improving ;)
Hope it helps