I honestly can't believe this was done with ZERO plugins. I would have liked a little more tutorial in that it tells me what petting the monsters does for them, and that you can only catch wandering monsters (not those in the tall grass). An excellent example of a game that has zero dialog and story as well. One of my favorite entries.
Suggestion: Tell the player what petting does, and give some sort of system to hold onto monsters you’ve already captured so you don’t have to give up a powerful party to just try and get to a secret area.