This is a solid 1st jam entry.
There isn't much to do, and the win condition wasn't coded; but it is not a bug riddled pile of inconsistent garbage.
There is plenty of nice and consistent pixel art; and I didn't encounter any bugs.
:)
My advice for next time would be: try to scope smaller, and focus more on the mechanic first.
This game felt like you started with the idea of "buy/sell loop", and then built up a little world and a backstory around a trader, before finally settling how buying and trading would work as a game mechanic.
I highly doubt you started with "we need to hit space on something spinning around a circle" and then built the peddling stuff around that.
:P