By the screenshots, I had high hopes for this project, but the gameplay is still quite rough.
The art itself is nicely done, and it shows that you've put effort into this project, but now you also have to focus in the controls of the character.
Just by increasing a bit the speed of the main character, and the acceleration, it would make a huge difference.
Also, there's some 'game juice' lacking. I'm missing sound effects for actions like jumping or getting damaged.
Keep working and fixing these thinks, because the result could be quite good if you manage to polish this game!