Polished levels 2, 4, 5 (first 25 files)

-Improved level design, timing, quality of levels 2, 4, 5
-Added TestNotes.cs script to help with Note timing and calculating
Teli's velocity.
This commit only include 25/845 files of the overall changes. Committing
in chunks.
Polished levels 2, 4, 5