I don't usually like platformers, but this is extremely well executed. The movement is so snappy, which I feel like a lot of people making platformers miss the mark on. Solid coyote time and jumping!
I liked the decision making element needed for when to place down a flag too. I only ended up using two but nonetheless saved me from a lot of raging! Also as others mentioned, the art is great, I find that too often the pixel art doesn't suit the game style but you clearly know what you're doing here!