Thanks Gammabeam! I did have bigger plans for the game but ended up putting most of my time into the usability. I found it was probably too confusing if you didn't know what you had to do and so added all the hints.
I've already got a new version well underway with a bigger galaxy, the ability to probe planets to find the best resources, relics that can be sold, 'Armageddon' events that destroy planets or mines and a vastly improved customer order/trade system. Most importantly though some actual art assets so the planets aren't all the same haha!
I want it to stay simple to play but with a bit of added depth for those who want to sink their teeth into it.
Thanks again for your kind words, it means a lot :)
Also, I really liked Trashoid. The attack method was rather creative and I loved the style of it, it was just genuinely good fun.