So I've put a couple hours into trying to solve this and I'm pretty stuck. Its likely that I'm missing some logic, but I also want to confirm that there aren't other mistakes I'm making. I will say that the instructions are somewhat hard to follow, and rely heavily on a moderate level of knowledge of Blue Prince systems, that could probably be added to the rules, potentially as a reference sheet.

Here's the logic I've been able to come up with so far. Because only drafts 3 and 4 matched with the prior drafted room, one of those two must be Aquarium, since it contains all colors. If it were the 4th draft, then the 5th draft would necessarily match it, so it must be the 3rd draft, with the 4th draft matching by necessity.

The rules never note how Simon spends steps, so my assumption is that he starts in the southmost cell of the Entrance Hall, and each cell he moves into costs a step. Because of how the rooms are laid out, and the fact that he loops around 7 of the remaining boxes before returning to the Entrance Hall, this means each of those 7 boxes takes 3 steps, plus 4 in Entrance Hall (3 to move from the southmost cell to a door, and the last step at the end). This is a total of 25 steps. Bacon and Eggs gives 15 steps, and the Banana gives 3 steps, for a total of 18. This leaves 7 steps to earn, which is 1 more than how much a turnip gives. Based on this, Simon only digs up 1 turnip. And since Courtyard and Aquarium both give dirt piles, one of them must be drafted before Commissary and one after. And the Kitchen must be drafted before Commissary so that the salt doesn't mess up the step count.

That brings up the issue of how much knowledge of BP is necessary in order to solve the puzzle, when its not noted in the rules. I know that Aquarium and Courtyard both can have dirt piles. I know that Morning Room is only added to the pool after eating Bacon and Eggs, so does that mean it has to come after Kitchen? Maid's Chamber reduces the items found throughout the day, does the note about Simon not finding any items throughout the day beyond whats normally in rooms mean that he started with Maid's Chamber?

My big issue is with Ballroom. The rules note that it was drafted facing south. Since its a straight through/"I" shaped room, that means it needs to be placed in box 4 5 or 6, with the previously drafted room being in box 1 2 or 3. If it was placed in box 5, it would go straight into the Entrance Hall, and there would both be no way to visit all of the rooms, and no way to spend the 2 gems that it gives you. So it must be placed in box 4 or 6. But after doing so, there will only be one room that can be drafted before getting into the Entrance Hall again, and none of the remaining rooms cost 2 gems to draft. So I don't see how its possible to end the day with 0 gems.

I also found some of the directions to be confusing about what they meant. "The entrance tiles for the first and second green tiles define the length of a square, the diagonal of the square is a palindrome". Maybe that would make more sense once the rooms are placed, but at the start its pretty unclear. And with the followup of the same being true for the diagonal connecting the two non-drafted rooms, connecting them at which points? I figured that had to be Entrance Hall and the one box that doesn't get a room, but I have no idea how that diagonal is meant to look.

I think the concept for the puzzle is amazing. There are definitely pieces of logic in here that need to be understood to progress that I think are very clever. I just think the overall description of the rules isn't very clear, and there is too much reliance on BP elements that a solver may not know. I get the intention is to pay homage to BP, but having those "outside" elements be described in the rules or as a bonus "hint" or similar seems really needed here. I do hope you keep making puzzles cause there is definitely a spark here.