A sense of urgency
To keep the game mechanics as simple as possible, I decided to focus on the puzzle aspect of getting around a solar system without any thrusters (jump and see where gravity takes you!). To make it more interesting and challenging, I added a timer—a limited oxygen supply. So, in addition to getting burnt to a crisp by the sun, you can now suffocate! Yeah!

I love it! Thumbs up for non-platformer games! (Seriously, there are way too many!)
Thanks! It IS a platformer game, in a way. Just not a conventional one!