This is a great first level. It uses a nice variety of terrain, and neatly is broken into 3 sections based on checkpoints. In each section the vibe of the level changes, which I like. I also enjoy the fact that the difficulty gently escalates with each section.
I enjoyed the visible spikes early on signaling danger. I enjoyed trying to follow the yellow arrow, getting stuck by brittle rock and then coming back later with the package.
I have two small recommendations for improvement. First, a number of the areas are easy to skip for speedrunning. This is perfectly fine, but I would consider having some hidden areas, especially with larger jems, so that people exploring or going after the highest score can still beat people who get points from speedrunning.
The other recommendation would be to use some backdrop to help tie the level together. The layout is great and some backdrop would help reduce the feeling of so many free-floating objects.
Overall a fantastic first level!