Really quirky and fun gameplay and successful execution of a lot of interesting mechanics and concepts. Concepts I've seen attempted before, yes, but not quite like this.
Unfortunately, I couldn't get past the writing and meme-ish humor (I did beat the game and got the true ending). For everything I gave a chuckle, there was something else that made my eyes roll. As mechanically and conceptually good as it is, I don't see this being a classic. It doesn't have that timeless quality that a game like Earthbound has. I played Earthbound for the first time last year, and that humor really resonated with me, even after all this time. 20 years from now, I feel as though Undertale's writing and humor will seem like a head-scratching mess that won't hold up under scrutiny.
Still, it's definitely an accomplishment, especially for one person. The music is great and the boss battles in particular are very creative and fun.







