Yeah, I mean I did my game in about the same time, but I have quite a bit of experience with RPG Maker in general (My total usage time is only 249.5 hours for RPGM MZ, which amounts to about 10 or so days including the time I've had it up post contest and the time I've had it up before the contest, but I've also clocked over 5250 hours in RPGM MV).
One thing I will suggest is to really get to know common events. You have some events that repeat and could be better controlled with a common event as they all do the same thing at some point. There are pros and cons to this, but the biggest pro is it makes editing easier if you decide to make changes. Instead of changing 14 or so events that all do the same thing, you have them all call the same common event and you change one common event to change all those events that call that event.
Also, as a note, the happiness ring from the statue will only work on the character it is equipped to unless you have a plugin to spread the effect.
I forgot to mention this here, but also, that shard kept showing up when doing the keys. Personally, the shard should've either been removed from the inventory on use or been a lower number than the cards so that the cards show up first.
I highly recommend that in the future, you give yourself at least 1/5th of your time to do playtesting and fixes if you don't have a dedicated playtester and 1/10th to do fixes if you do. This isn't industry standard, but it gives you some leeway to see if anything is wrong and then make changes.