Great job so far! Couple issues I noticed for you to fix for when you're finished:
- Game resolution is sized very strangely, sits to the far left of the newgrounds page
- I couldn't finish the game because there was a strange branch thing with a much larger than itself collider that fell down the tunnel with me and got me stuck
- Some objects are drawn in the wrong order, like the clouds being in front of the fish that jump, the rock I can push being behind everything that I'm in front of, etc.
Other than that, this is an awesome start! Parrallaxing BG was a pleasant surprise, and it was enjoyable and felt nice to control. Keep it up!