Overall, I enjoyed this level. I liked that each room had a different aesthetic, that was a really nice touch. I enjoyed that the levels got more difficult as you went, and the fact that the last level was much larger and more intricate. I especially enjoyed the music change near the end. It felt a bit like a boss room. I enjoyed the jems taunting the player throughout the level, like a hard mode of some sort.
The level creator was generous with the checkpoints, by providing infinite checkpoints in the central area. Still, I might have liked one int he third room since I spent probably 8 minutes alone on that room. Especially frustrating is that I beat that room, but investigated the arrows and the hidden area and got myself killed in short order. It took me probably a dozen tries to beat it again. I really enjoyed the clouds acting as a brief chance to catch your breath while you were falling.
My one other bit of advice is that the second room felt like a missed opportunity with the burny whirlers being static. Turning them into a dynamic movement puzzle could have been a great way to add some variety and to bridge the difficulties between rooms one and three more smoothly.
Overall an enjoyable level, and I look forward to see what else the creator makes.