This was really good, I thought! Mechanically, it's actually a game. Interesting ideas for mechanics. Orbital mechanics! Your tutorial was superb. I know how hard those are to get right on a jam timeline. Yours communicated everything it had to. The music in the game was so soothing and awesome.
I'll mirror a few of Giggs' comments in that I wish it was easier to retry. If I fail, slam me back at my zoom level and focus area with the old trajectory line already drawn on and the power and angle still locked in. That would make the finer adjustments a little easier. I also really wish the dotted line trajectory drew a LOT faster. Like, instantaneous would be great. It would be tough to enter in values and.. then.. wait.. to.. see.. how.. close.. it.. ah, no too far to the left, let me try again.
Writing was great in general. The ending was hilarious. The fail state text about the dead frenchmen was hilarious.
Really nicely done.