Very cute! I love the expression on the astronaut's face when he's jumping. The music is fantastic!
I would suggest making the oxygen deplete quicker. I was never lower than about 80%.
Yeah, it could do with a lot of tweaking the stats glad you enjoyed the music, I was inspired by my memory of this as a kid https://youtu.be/yasiyS7dkcU?si=K51w-h4qd74AfYL2