The game is fun the story is good but there are some problems with it. 

The game takes a performance hit as you play the game I have come to believe it is because of the added party members but I am unsure if it's because they are in the party or because of the party train. Any time they were forced out of the party performance would jump.  Oh and early in the game only the head of the train is effected by environment hazards but later on they start getting effected this has the unfortunate consequence of making a certain bumper puzzle a real pain. "Splash" (Maybe an option to disable the train?)

The bottomless Milk jug doesn't give the skill it claim's it dose and it pretty useless from what I have seen. 

Regen seems to be a chance of happening instead of a percent every turn (But this might be on me because I don't quite understand what counts as a turn as I have had characters unable to use a skill with a CD of 1 turn for their next two actions)

These are the only problems I can think of off the top of my head so I guess some nitpicks

As you play you can amass a large stock pile of seeds that if you want to spend on stat upgrades becomes a tedious task. (Maybe make it so you can buy multiple upgrades at once if possible or turn it into a store for stat upgrade items instead)

There are some crystals that would fit so much better as passive upgrade like the herbalist crystal.

You go to a magic school but don't learn anything no magic or recipes. (A bit of a let down, but might be something you just haven't implemented)

The fertility artifact side quest has such a huge effect on the maid while having absolutely zero effect on the players party who has also been in direct contact with all the artifacts and that just kinda bugs me.

When I first got to the floating temple I could of sworn she said there was someone who would upgrade my passives (Might be me misremembering what she said or something just not implemented yet)

I can't use the temples smith like the preview image on the page shows ( I could be bugged or it's just not implemented yet)

And I'd like to request newgame+ be a feature of the game as well as a copy of the enemy booster npc from the  floating temple be placed into the debug room.

And lastly sorry for the wall of text but I felt It was a requirement since this isn't just a comment and I'm also enjoying "The Fertile Farm".