I really didn't like Undertale either. I kind of hated the gameplay and the story, at least in the beginning, was too weak to make up for it. I can't stand bullet hells and I'm terrible at them, and the sort of top down Zelda type stuff was far too easy to be engaging and just tedious to get through. People tell me if I suffer through more of those beginning parts, the story gets really good, but if it did, I never saw it. Closed the game after... less than an hour certainly and never went back to it.