Hey, so, first thing, your game idea is great, and the art direction is even better. I simply love the palette you chose.
Regarding the gameplay, it feels a bit "clunky" to me. Disabling horizontal movement while jumping can feel more "realistic", but it's not very intuitive for a platformer IMO.
A few times I felt input delay, I'm not sure if it's an issue with delta multiplication or just an FPS drop.
That said, the game is fun and really nice looking, congrats to the team!