This is a great concept and I love these kinds of puzzle games, I managed to win on my fourth try but only after reading your comments.
A few more hints and better feedback on how placements affect the score would go a long way to easing the frustration as it wasn't really clear what I was trying to achieve until I was already deep enough into a run that the percentage changes from each placement were too small to tell what I'd done right/wrong. Even something as simple as letting us know the score we need to get to to win would allow players to make the decision to just reset when they get to a point where they're clearly not going to make it rather than getting more annoyed by continuing an unwinnable game.
Quality of life stuff like options to rewind turns, replace items and reset the game would help smooth out the experience too.
Overall though this was a nice little chill time and very impressive given the timeframe!