I very much like the idea - blending two genres like this can go either way, but you've managed to pull it off - and I like the graphical style.
-The controls for the platforming sections are far too floaty and slippery. A couple of times, I slipped off the side of (I think) the second jump because I kept the D key held when the character's head got caught on a platform and they floated further to the right than I anticipated.
-Continuing from that point, perhaps space out the platforms that are in a zig-zag pattern so that there is more headroom for the player to jump.
-I like the fact that the first puzzle is so simple - it works extremely well as a tutorial level for the puzzle sections. The mechanic is easy to grasp due to the inclusion of this introductory puzzle. Then, the next puzzle introduces different shapes in another safe and simple setting.
-I liked the music, but it's a tad quiet compared to the other sound effects.
-The coffee meter depletes so fast that if I made a single mistake on the platforming sections, I was already doomed. This isn't helped by the fact you have to start over. Or at least, I didn't get far enough to reach any checkpoint... I know I just praised the introduction level, but it gets annoying after the 6th time. :p
-While I do really like the idea of the visibility reducing as the coffee meter depletes (it reminds me of when your eyes start to shut themselves when you're REALLY tired), the effect is perhaps a little too extreme here. I think that's just my opinion, but it's one of the many things that make the platforming difficult.
-I do appreciate that the puzzle levels don't have a timer of any sort. I think the platformer sections ought to be a bit hectic (just toned down a little), with the puzzle levels acting as a well-needed cooldown period.
It's a solid idea - it just needs a bit of refinement for the platforming sections. Why not try tweaking things a bit and upload a post-competition version? Also, an idea that just popped into my head:
-When the coffee meter is low, you could try blurring the scene and adding snoring sounds or something? I think you'd have room to add something like that if the current eye-shutting effect was toned down slightly. It'd really feel like you're falling asleep then!