Very interesting idea and a solid concept, I like the type of music for both characters but it's correct to say the music for Pixie is more threatening than red? There are some minor situations where the characters are blocked and it's necessary to restart the level.
Also, I think the game requires some polish on a specific points.
At this moment, I am at the beginning of the game and I can't wait to finish the game in the next session.
As for the Art section, I have only one word: good job! It helps the player to focus on the game and to calibrate the jumps.