Really brilliant idea for implementing a chase level without paths or an autoscroller by requiring the player to sprint to make certain jumps. I really appreciated the jems to help with the jump timing, those were a huge help. I like the variety of the terrain and challenges and the mild puzzling. The hidden prize blocks were funny without being too trolly, which is a hard line to follow. The timing with the burny whirlers makes the player feel accomplished, which is great as well.
Three small changes would have earned this level the Popdonk Recommends badge. First, some use of backdrop to signal how much thought you clearly put into this level and to improve the aesthetic a smidge. Second, checkpoints, checkpoints, checkpoints. A few strategic checkpoints would have opened up this level to a wider variety of skill levels.
Lastly, I love the little jem area you have at the start. More opportunities for more jems or bigger jems would allow for players to get a top score without beating the speedrun time. This would also open up the level to a wider variety of players.
That all being said, for a first level, this is amazingly well done. I look forward to whatever you make next.