I saw a lot of commenters say that they couldn't bring themselves to finish the game, and I understand that to each their own, but I really didn't find it difficult so I'm not sure I get how they're falling.
Anyway, I had a great time! For these types of game, a character control is primordial, and I think yours was very good and responsive, which made the experience really enjoyable. The only time when it didn't work out so much was, as someone else said, on the trampoline, as you can't gather speed while airborne, if you bounce straight on a trampoline or if you hit something in your jump that stops you, you enter a loop where you can't do anything but bounce forever. You should let the player move just a tiny bit when airborne, it would fix this issue and in my opinion feel better for the section with crates you have to climb with only a small place to speed up.
I tried to listen for the easter egg, but couldn't hear it sadly. I'm not sure if it's something that's only audible if you're close to it, or if it's always there, but I didn't hear it nonetheless. I even went out of map by jumping on the building edge after the first elevator in the upper part, but there was nothing to be found there either haha
Great game!