Good job completing the game!
The paralax effect is a bit off.
The backgrounds are not connected properly sometimes.
There is no danger or real goal, basically you can leave the game unattained and it will win itself.
Maybe you shouldn't use music from other games in your game? This is never ok, even if you mention it in the credits. You have to use royalty free/Creative Commons/music that you have license for.
Check out incompetech.com
Nice graphics.