What worked:
It looks neat and the curved effect give an impression of wearing a helmet of some sort. Rocket jumping is really fun, but it took me a while to realize it was killing me haha. I like the idea of exploring into darkness to find lights, which then make return exploration easier. Getting the lights works well.
What didn't:
I'm not entirely sure what the objective is. If it's to light up everything, I'd like to know that. If it's survival, a timer would be appreciated to have something to work towards.
Those fish are mean! The tiny ones are really hard to shoot due to the gun being projectile based (rather than hitscan/raytracing), so it ends up being a mad rush to health kits rather than trying to fend them off. On that note too, platforming is very difficult when being slugged in the face repeatedly.
Bugs:
Music slider isn't set right.
UI doesn't properly scale when window is maximized (at least the sliders aren't).
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Great job!