I liked the premise but unfortunately the game isn't working properly for me.
On my first playthrough the ship just kept flying after getting past the asteroids and UFOs until I eventually died and repeated the stage in an endless loop, then after reloading the page (and getting the medal for some reason) I got what I believe was the intended text message for completing the stage "Congratulations, player! You have survived the wave of asteroids and UFOs." but the stage started over with the ship flying over the early access preview message but with no UFOs or asteroids, then after reaching the planet again the space stage started again in front of the image of the space captain after he explained the job and introduced us to the ship again and then the stage entered an endless loop in front of the early access preview message.
I'm playing on Firefox and Windows 10, hopefully you can discover what went wrong.