Great Game there buddy! :)
Pretty well planned out.
The feedback I would give, is like crouching, when a button is pressed, like C or Left CTRL, the player crouches. Also you could add running, stamina, so the player couldn't run all the time.
I like the trail that you added to the player, but when the player is facing to the left, the trail is infront of him. Try changeing the order layer on them.
And I think that's all of my feedback.
I hope you and this game gets a bright future! Have a nice day/night!