An advice: make the castle sprite bigger, currently it looks like it’s the castle of the dwarf empire (even if it’s a figurative style for game purpouse). It would be nice to see Kendrick showing up at the gates of a huge bricks wall (even if we can’t see the entire castle), or showing up Kendrick at the top of the castle, fighting flying monsters, before reach the edge and jumps to ground, falling during a while (with some dust and trembling effect when stomping the ground… hooray!), showing the massive size of the castle.
A tip: I was recently dealing with parallax scrolling and discover if the parallax effect is added into the Y axis as well, at a superior speed of the parallax scrolling for the X axis of the same layer (1.2, 1.5 or twice), the game flow will look a lot more dynamic and fun. Here is a video of my current project, at this point in the video you can see some Y-parallaxing effect: https://youtu.be/Pn-W8lrWrI0?t=12.