Nice entry, and a fun platformer! I liked the design of the levels and the presentation, which were very charming! I also thought the level editor was a great touch; glad to see that as an option! As others have mentioned, the acceleration of the jump felt a bit off/floaty. Also, having a few more platforming challenges that emphasized the dash would have been nice. Still, I liked the variety. This was a fun one; I'm glad I was able to play it!
P.S. - I appreciate the reference to the Peanuts with your game's title. A+ for that!