The game isn't so hard, you just need to understand things and use your brain, the objectives are pretty clear if you use your brain, Sai is an amazing character, hell, maybe he's clingy, but the fact that he didn't sacrifice us was a good thing, removing him would pretty much destroy the game, as he was there to help the mc that she could change, and him feeling comfortable with her was something new for her, as only her brother had felt that way with her.
The minigames are fun, they might be complicated, but, that's what makes them so fun, you can always skip them if you are not good enough to beat them. Potato chips are used on so many ways, the bucket is also useful, valves are pretty important too. If it's too hard for you, you can always just quit or follow a guide, I've seen good guides online.