Great event! I think the mechanics are great, but as you and others have noted, the prices/odds likely need some tweaking.

Before the shop opened, I personally did some expected value calculations. Back before the price was lowered from 7 to 5 (I think, for the special prizes), you needed to buy like 140 coffins to expect the # of tickets you needed for the unique prizes. When the amount of candies for that many coffins was compared to the EV of what was likely going to come from the Chests, it felt like a no-brainer to choose Chests. Unless you were a whale and had more than enough building material. Then the coffin gamble was probably more interesting.

Not a hard "fix," and it could be perfect depending on how fast you want certain items to start circulating in the economy :)

The lil dopamine hit from the random chance per action is great. Really motivates and rewards game interaction. You may consider building this points system in permanently as like, XP or something (fixing the little "hack" where you can plant cooled down seeds on Day 14 in the season first maybe). Once a special event comes around, keep the XP going but also add in the seasonal shop.

Cheers! Looking forward to seeing what might crop up for the holidays, 😉 !PIZZA