Thank you for your feedback.
I added the controls to the game description and as soon as the ratings are over I am going to add support for arrow keys and Dvorak, and other keyboard layouts for languages which don't use "w" or Latin letters.
I definitely agree that the repairs are not properly balanced, especially the retro-thrusters as you mentioned. I have actually already addressed this exact issue in both the game description and other comments. The weaker repairs are the results of features which were unable to be implemented in the 48 hour deadline and other changing features such as enemy ships, obstacles fit for the retro-thrusters and how the sensors and life-support ended up working. Persegan noted that the weaker repairs resulted in another interesting, albeit unintentional, game mechanic where you are not only avoiding asteroids but bad repairs. This is actually the reason I still kept the upgrades in despite the missing features. As fun as this is I still think it is unfair to have unbalanced upgrades and wholeheartedly agree with you.
I might get around to finishing this game and making it an infinite runner after the ratings (although to be fair there is nothing stopping me from starting development rn) but I have recently begun experimenting with ray-tracing in the browser so I might not find the time. However, I'll definitely keep your suggestions in mind.