Hey ☺️ thank you so much for giving it a go 🙂
In the second and third level you need to jump with dash and double jump as far as you can and then fall, after shadow follows you to the middle of the gap you can teleport back to it (even after you died) and complete the jump (you'll have double jump reset after teleporting back to shadow)
Now I am thinking I probably should have left just 2 levels as the third and second are pretty much the same...