Very well done game, nice job! I played to the finish and had fun. The artwork has a nice, serene style, I loved the parallax background layers and in the pink zone and the bloom on the mushrooms. The spear and acorn mechanisms worked really well, and the challenges were nicely designed. The map was also nicely designed and worked well. Very solid work all around!
Some hopefully helpful feedback: My spear disappeared off-screen a few times and wouldn't come back, but this was always remedied by dying, and you did a good job including many well-placed checkpoints. I also felt the lack of coyote time, as others have mentioned. And I would suggest making the colliders on spikes to be in the shape of the spikes (rather than a square), as dying at the upper corner edges of those colliders when jumping over spikes felt "unfair." But these are very small issues on a great game -- nice job.