difficulty spikes with boss battles and sometimes even normal enemies digivolution system is *really* weird and unnecessary complex to the point that even while following an online guide, you might end up with mons you didn't want complex gameplay loop that features time management mechanics, taking care and training your mons, rebirth and town building semi-open world that gives a feeling of a real adventure
battles are mostly automatic, but you can give commands every few seconds freedom with evolutions (you can easily get mons you want) more customizations (equipment, multiple in-battle skills to learn)
Definitely check out some let's plays on YT first.
