It is occasionally quite silly, but there are some good (if archetypal) storylines going on, and the gameplay loop is a lot of fun for me. The plot starts out as a very basic cute fantasy farming sim, and then it takes a couple of VERY weird turns (more details under spoiler below) but they remain interesting.

storyline spoilers for Harvestella, post chapter 3

So the first three chapters are "go to these cities and solve their problems" and if you do them in the logical order, the last one ends up with a giant mecha, and from there, the plot suddenly spins around and zips into "hi, we're deeply influenced by NieR and Xenogears" very strange post-apocalypse futuristic things. It....works, in a weird way.