We're glad you liked the game and thank you for great feedback.
I think most of your points are valid, just a couple of things, the looping animation was intentional, we thought it would look kinda funny since gravity is low and player's in air for a while after jumping.
You can also turn using arrow keys, I'm interested to know if rotation speed of camera was too fast for you.
And about lightning, we were so worried about performance that we tuned down a lot of things so everyone can play, but yeah we probably should set the default to polished for windows.
Again we really appreciate you taking the time to play our game and giving us valuable feedback.