Hello, this is the level designer that worked on this!
I totally agree with you. You can really see that the curve is not great especially considering Course 7 (which is pretty easy compared to the adjacent ones). I wanted to change the order of some levels, but that was relatively low priority in the task list. Also, the white blocks with no collision were something that I would definitely tackle next had we more time. Sorry for that!
Glad you enjoyed, Elendow! Thank you for your feedback!