Great work with this one. Super atmospheric with a cheerful vibe. The art is great and the world feels suitably mysterious with the labyrinth-like level design.
My main critique would be the jumping controls. I messed around with it for a bit and I think the reason why it doesn't feel quite right is that the player loses its horizontal controls while jumping. Seems like horizontal velocity is only applied when the jump button is pressed (either on the ground or mid-air in a double jump). I think fixing this one thing to allow the player to control the direction of the character mid-air at all times would do wonders for making the game feel more responsive.
Otherwise though this is a superb entry, and well deserving of a great rating. Well done team :)