I absolutely love this. I hope it will become commercial like your other titles so you can work on it more. I have a few suggestions though.
First, a way to know your altitude relative to the ground. This would help in being able to come down slowly. Second. A measure of how fast you're going when flying. Third, a way to know when you can use your jump jets again.
In the synthesis screen, I think a sound when you actually do the craft would help cement that it has been done rather than the button disappearing. It's a little confusing at this point to know what you have already done.