Really cool concept and nice combination of platformer and rocket gameplay. The rocket wasn't very intuitive to control and quite unforgiving but I got the hang of it after a few tries. The art, lighting and FX work is really solid though to me it feels a little inconsistent in style. Some of the sound effects do get a bit on the repetitive side but not a deal breaker. Overall I enjoyed it and it's clear you put quite a bit of work into this so good job!
As has been said the browser performance wasn't so great which dampened the experience for me but hey at least you had a web build!