Where it Shines:
Music - 8/10
Quirkyness - 7/10
Humour - 7/10

The Good:
So Undertale is definitely an achievement for such as mall team. The throwback to weird SNES era JRPGs like Earthbound is apparent, as well as all the references to other things.
The humour, world, and music are probably what the game does best. It also has a very interesting cast of characters, though some can get pretty annoying pretty quickly.

The Bad:
Hoo boy. Where to start. I wanted to like this more than I did. But this game is a little too "look at me I'm an indie game" if you catch my drift.
What starts as a deliberate, well paced adventure, quickly becomes a slog in the last couple of hours. Obtuse puzzles, annoying bosses, and a story almost entirely exposition dumped onto you like you're some kind of exposition flushing toilet.
I went pacifist route, and I think that's part of the issue. The pacifist route has become so proliferous in this game that even going in to this knowing almost nothing, I knew I was supposed to do that route to get the good ending. But the weird ass flower battle at the end is such a fucking insane choice, it looks like garbage and plays like garbage.
So then I realized oh, you're supposed to befriend some characters, and I missed Undyne because you'd have to go back and talk to her if you want to befriend her; it's not linear.
This game wants you to play it multiple times. I have no desire to play it multiple times. I don't think the story, the endings, or the gameplay are good enough for that.
It also tried to break the fourth wall a bunch but it's really obvious and not very well integrated into the story. The game really feels like it's 3edgy5me and uses literal rage faces and memes. I don't think that makes it subversive or meta, it just makes it obnoxious, which explains it's fanbase.

This game is overrated as heck.

Summary:
I don't regret playing it, but I would not go out of my way to recommend it to anyone. It has a lot of good things going for it, and I can see some people loving it (clearly many do), but this game is just not as good as people make it out to be. I think something like One Shot does a much better job of being evocative and quirky.

TL;DR - As Peter Griffin would say "It insists upon itself".


Note on my ratings:

Treat my stars like Michelin Stars - just having one means the game is worth playing in some way.

1/2 ⭐: hot trash garbage, since you can't do zero stars here
⭐: below average, needs work
⭐⭐: average
⭐⭐⭐: pretty good
⭐⭐⭐⭐: excellent
⭐⭐⭐⭐⭐: all time favourite

Woow, esse aqui é uma peróla do indústria indie, e amigos, que jogo fantástico. Admito que tinha preconceito com o jogo, por conta dos gráficos e jogabilidade fora do comum, MAS, que bom, que bom que perdi esse preconceito e tomei coragem de jogar.
Cara minhas mãos formigam para falar em 100 linhas sobre como esse jogo é incrivel, como tem diálogos impactantes, história FODA, e tudo isso em um jogo SIMPLES, COM MENOS DE 200MB? Eu fico indignado em como o Toby Fox conseguiu fazer essa proeza.
Eu peguei a vibe do jogo em 30 minutos de gameplay e nesse momento já queria virar a noite jogando de tão divertida que é a gameplay e como é inesperado os eventos que acontecem. Flowey é outro personagem GENIAL, e o que quebra a 4 parede de forma inteligentissima varias vezes, esse safadinho conseguiu me ler completamente várias vezes (SPOILER: eu matei a Toriel na primeira vez que joguei porque não sabia que dava para poupar, resetei meu save de pena e a flor me disse que sabia o que tinha feito, e ela disse que eu fiz isso exatamente porque me arrependi, CARA, como que eles pensaram nisso, fiquei me perguntando. Eu nunca vi isso em nenhum outro jogo. Me senti culpado por alguns dias admito porque parece piada, mas esse jogo realmente te toca e te faz ficar muito imerso).
Um tópico somente para as músicas desse jogo porque, cara, como que o Toby conseguiu programar esse jogo, pensar na história e ainda fazer músicas tão boas? As músicas desse jogo são um espetáculo, cada uma transmite sua emoção de um jeito único. Eu me sinto cheio de DETERMINAÇÃO toda vez que ouço Hope and Dreams.
Você se sente acolhido pelos personagens do jogo, e parece que está inserido naquele universo.
SPOILER: Rota genocida: se você fez essa rota, de duas uma, ou você é um psicopata, ou só fez porque queria saber o que acontecia, ou seja, de todo jeito você é um assassino sangue frio.
Dito tudo isso, um jogo realmente espetacular, totalmente fora da curva e inovador!!

Undertale is such an important game for me, its been with me since junior high and I've always come to replay it often every year. Because I have so many hours on it and know the story well, I usually replay it for the neutral route, but I don't shy away from true pacifist or genocide either. Anyway, today after talking with a friend about the game recently, I decided to do another neutral route: I only attack when I get hit. I've played the game so much that I only ended up killing a few monsters: Two Vulkins and Muffet. But here's the thing about Undertale that makes it so special: I was also hit by the Royal Guards. After telling RG1 to whisper to RG2, I couldn't bring myself to go through with it and broke my own rules. The fact that Undertale is able to make me care for characters with minimal screentime that I've seen over and over again just goes to show how great the writing is and how much charm the game has. All three routes are fantastic, especially True Pacifist which has a super emotional ending and a perfect final boss. Genocide is a pain to get through, but the two exclusive bosses are the most fun to fight and make it worth it, though nothing will make the ending worth it due to how awful you feel after. I'm sure a lot of people know the story by now so I don't need to go full into detail, but just know this game is perfect in every way. Overall, Undertale still remains one of my favourite games to this day and is a masterpiece.