Looks good! Can't wait to try it!

I understand being busy and excited for the games release, but you should know that distributing the game without giving proper attribution is technically a violation of the asset's licenses. I'm not trying to be a cop here, but you should try to get your credits listed as soon as possible. I'm confident all the artists are understanding and happy to see their assets being used in your game. The assets are free, but the agreement is that you give credit any time you distribute a game and- if any of the artists decided to be a stickler for the rules- you've exposed yourself to some legal trouble until the credits page is in the game.

Currently, I have not added any credit section in game. I will add it later on, it is work in progress.

"later on" should never be after you've released it to the public. 

Played it. Good use of parallaxing backgrounds. I like the challenge curve as well. It ramps up gently but significantly. I wonder if you could add power-ups to add some flavor. You may have already, but I hadn't encountered any as far as I got. Perhaps something that increases the jump movement speed. Or limit the number of "double jumps" (mid-air direction reversals) that the character can perform before he has to make contact with a surface, then provide a power-up to increase that limit.