This is great! Just the sheer amount of puzzles you have managed to create for the jam is commendable in itself. Loved the art direction too!
As the commenter before me said, some visual clutter can happen. My feedback, you can choose to consider for later:
- The boxes immediately move from the start, which was a bit annoying for me (although I understand some levels' mechanics are built on changing the setup mid-flow). Maybe some kind of start action would be nice, so I could survey my resources first.
- The other intentional but confusing element for me was that the streams can cross.
- I ran into a bug on one of the portal levels, where after I sent the wrong box type once, the counter hasn't accepted any more of the right ones either.
Overall, I think you could turn this into a full game anytime, and I'd expect it to perform well among puzzle-lovers. You have nailed most aspects already :)