Good game! The artwork is incredible. Very cohesive and professional. I wish I could commission the artist for my own 2D game.
My biggest problems were really my own skills, I'm not good at platformers in general. I'm also assuming it plays much better on a gamepad, KB+M is always a struggle for games like this.
My only nitpicks besides the controls would be that it wasn't always easy to tell what I could walk on and what I couldn't.
Keep it up!