Really great start. I like where you are going with the lot of this stuff. I really appreciated the checkpoints you put in there. I thought the double use and puzzle with the missiles was brilliant. You present the player with an impossible challenge and then an “a-ha!” moment. That is good level design.
I probably would have blocked off the top part of the fire whirlers if you wanted to force people to take the bottom route. If either was valid, I probably would have added some backdrop or a bit of roof to make it feel like both were valid paths.
I’m not a huge fan of that single secret leaf area on that jump early on. While it’s a fun surprise, players might get discouraged because it doesn’t look like they will clear the jump and may give up early. I would also maybe do something slightly different with the saws in the beginning, maybe put in a camera object? It’s frustrating to barely be able to see the saws and plan your jump.
The little secret in the one tree is great. It make the player feel smart but also makes them work for it if they want to those Jems. Great design. I also like your varied used of blocks to create different challenges.
The part with the vacrat is very challenging because you have a tiny ledge to land on and he moves fast. If it’s intended that way, great. If you wanted it a smidge easier, you could make him smaller.
I’m currently stuck at the part with the package cam and it’s an interesting puzzle.
Overall fantastic start. My one other piece of advice would be to add a bit more decoration and blending for transitions from tree to kronkrete. Other creators, not you, sometimes just throw whatever onto the screen with no thought for making it coherent and smooth. As a result, if I see lots of random floating bits or jarring transitions, I subconsciously assume it”s a low quality level. Your is not a low quality level!!! But, my lizard brain doesn’t know that. Some decoration and transitions would signal to me how much thought you put into it.