(I have beat everything but 120 and 119 and maybe a couple I skipped and forgot about) I like it a lot, not the most perfect about a 4.7 but still honesty the only "gripe" I have with it is that the portal gun was only used at 107 also you could have made a level where you portaled into your item hotbar.

edit: when I was looking at all the puzzles to see if you snuck any white portals in any levels item bar and found out 120 answers and you tickled my gripe a little, so I give you a 4.8