This game is pretty fucking bad. It's extremely cringe, but that's just a personal thing. Half the time I can't switch my ...ugh... Oppaimon. I can't even change which one comes out first. The game in general feels unresponsive, having to click or press a button 2 or 3 times more than I should need to. I keep clipping through walls. I can't talk to people or pick up items from the side, I have to be in front, which is stupid. The English isn't the best, but it's ..okay I guess? The writing is bad but there's not much to expect from a game like this anyways. The art could be better but it's ...okay I guess. This game is underwhelming in all categories. Completely mediocre all across the board.
Also to add to the game engine talk earlier in the thread, they could try Game Maker Studio 2. It has a drag and drop type way to make games on it if you don't want to script. I've tried it out and it works alright, although they might have to learn to script a couple things anyways. They'd have to buy a standard license, but it's not that expensive and they make more money on Patreon than this game is worth in it's current state anyways.
They probably should've tried making an easier kind of game, brush up their skills. JRPG type games with menus and all that are actually on the more difficult side of the spectrum of games to create. I guess all I can do is wish them good luck.