Edit: The author has made some changed based on feedback
I found this to be a nice simple level. The overall design makes good use of backdrop and decorations to create multiple different areas. There are regular checkpoints, and given the lack of ways to die, the level is pretty forgiving. I think it’s great looking overall.
I think there are a couple of changes that could make this level really enjoyable. First, I would make the decorative flashes a lot slower, probably 4 times slower. I was having a lot of difficulty orienting myself at the start of the level, but this wasn’t an issue once I got going. I’d also see if there are any good ways to have an escalating sense of difficulty throughout the level. By expierment with gap distance and possibly some hazards, you could have each section get more difficult than the last, building the player engagement.
Finally, I would continue the theme of a score route and a speed route, which I really enjoy. The use of hidden areas and by making some jems more difficult to reach could really enhance that. You could also have a few level skips that are really difficult to use, such as a spring jump with spikes to avoid, that could give a super short route for really skilled players.
Overall a really great second level!