Your game was very charming and simple. I really enjoyed the level hub, and that I could move around (it wasn't just an array of buttons to click). I liked that I had to trigger in order to open the doorway/walls to victory.
I think the yellow blocks are a really cool feature; I loved the sound FX and how they fell. The ones I landed on had some odd physics behaviour on level reload (sometimes I saw it floating away), but ultimately, it made for an interesting platformer experience.
Good job :)