Trading nothing for something

This game is from ldjam.com, which is currently unavailable.
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overall: 3.50

fun: 3.17

innovation: 3.61

theme: 3.94

graphics: 3.06

audio: 3.38

humor: 2.92

mood: 3.03

itch.io Source Windows

This is a puzzle game where you trade items with different traders to get the correct item combination that the door opener demands to open his door, so that you can proceed to the next level.

Speed run of the game (by me). Spoiler Alert!
https://youtu.be/yuXlLWVfpgo