The games made very well, but it wasn't my cup of tea.. I found it a little boring :P But thats just my personal taste. The lighting is really cool, top job ^_^
I replayed this, and have to say my previous comment was wrong. There is no need for a minimap, you can tell nearby planets by their gravitational pull. The game isn't extremely hard, but survival mode is unplayable, I flew around for five minutes before finding one asteroid, it's more of an endurance challenge... a very boring one =/
It doesnt seem complete. Like most, i too think its too hard. The addition of actually being able to see a little further ahead, or a minimap would make this feel more 'complete'