I think what they meant by " I didn’t think that was even possible with rpgm" is that they didn't think even RPGM could have this many "bugs". Not that it's an RPGM game. I personally didn't experience any issues playing this game either though.

very unlikely, rpgm games have pretty much no bugs - at least not engine-related.
ren'py is completely another story... though i usually don't have problems with it, but many people report them.

Alright. Figure since I play these games often, I might as well offer a little help. In no particular order, here are some tips.
Notice: This is another time consuming game. It's one of those where different events can only happen at different times, after you've already met certain requirements. However, don't worry, there's no time limit. Games like this come down to efficiency, and the only real way to be efficient is to know what you're getting into. Follow the thread for more tips.

1. For the love of god, save your game. Try to keep your "newest" save in the same spot on the first page, preferably whilst in your room so it's easy to keep track of. Obviously update this save often. This is important when trying out multiple routes/possibilities with what time you have.
2. Visit the park and the beach often to see if you can collect more materials. (These are clickable seashells, berries, and flowers.) You'll get paid for selling these at the mall.

Aside from selling them, you can visit the crafting bench in the school storage room (If memory serves correctly.) You can craft an exp amulet with the aforementioned materials. (F.y.i, different colored flower means it has a chance to spawn at a different time.) THE AMULET IS THE MOST USEFUL ITEM IN THE GAME. It doubles your affection progression, aka boosts bars twice as much. I was actually pissed when I found this out in late game.

Number 3. Invest in the bitcoin miner upgrade at the mall. Yes it may be 500 but god knows it's worth it. From there, buy the mortar and pestle to craft more things at the school workbench, you'll end up needing them all at some point anyhow, and after crafting them all, you'll never need the materials again, so you can just sell them for money.
Number 4. You can only mine for bitcoin once per day, so be sure you're getting it in before midnight, because you won't be able to do it then.

And finally, Number 5. For the love of all that is good in this world, REMEMBER TO DO CLUB TASKS AT NOON. Put some time aside to just grind it to max level, it is so worth it. It's accessed by the club board. I forgot this in my own playthrough, and trust me, you will not want to do it once the story starts getting good. That's about everything I can think of. Hope this helps everyone out!

Says the retard