Beautiful game! Read my (Long) review, As I have a lot to say (because I have played this game 5 times.)
First off, Let me say that this game is NOT "Satanic" or "Disturbing".
The only CLOSE thing to "Disturbing" is the final boss fight of the neutral and pacifist routes.
Good messages: 5/5
The games MAIN message is that all conflicts can be resolved without violence, and that you should always to the right thing. The games also has many themes about differences, Loss, And anger issues (Flowey).
Good role models: 4/5
There are many characters who represent specific feelings or emotions.
Undyne: Determination (Pun not intended)
Papyrus: Happiness and goofiness.
Sans: Humor, Defensiveness, and also represents a roe model for his younger brother. While Sans is lazy and sometimes apathetic, He cares for his brother very much.
Alphys: Love, Helpfulness, Inventor, (And also Alphys IS lesbian for Undyne, Not that there's anything wrong with that.
Flowey: Anger and Loneliness.
Toriel: Care and protection
ASGORE: Loneliness and also care and protection, Feelings of loss.
Swearing and vulgar language: 2/5
Undyne and Sans (In the genocide route) both say 1 swear word each in their boss battles, Such as:
And Flowey calls the player, Frisk, an Idiot MULTIPLE times.
Sexual content and other stuff like that: 1/5
In the True pacifist route, You go on a "Date" (Which is only there for comedic purposes, so nothing sexual happens) with Alphys, And you get to role-play (To help Alphys build up courage to confess her love for Undyne) as Undyne, And you are given the option to act as Undyne and say "And then Undyne kisses you" to Alphys, And Alphys gets flusterred and hollers "UNDYNE! I LOVE YOU! KISS ME AGAIN, UNDYNE!" Although it is just role-play and doesn't exactly happen in that scene. (Although they DO kiss in the credits, But its just a peck on the cheek.)
Some sexual references which will go over kids heads, such as when on a "date" with Sans's little brother, Papyrus, If you ask papyrus you want to have the date in his room, He responds with:
"Sure, Lets go into my room and do whatever people do in the others room on dates!"
(All they do is talk and you have to respond to questions and eat spaghetti, Nothing sexual.)
Violence and scariness: 3/5
One of the game's final boss (Omega/Photoshop Flowey) is mildly disturbing and WILL give some immature kids nightmares. There is also a "True lab", Which houses creepy and unsettling mixed-together monsters, And there is a weird white figure that tucks you into bed out of nowhere, But other than that it just has an overall EERIE vibe.
While you DO have the choice to kill and kill and kill, there is an emphasis on pacifism, and you WILL get punished with a jumpscare and a corrupted file if you kill every enemy you find. Which is called a GENOCIDE ROUTE. It sucks and is really hard.
Drinking, Drugs, And smoking: 1/5
There is a pub in Snowdin where some characters appear to be drunk, But there is no actual beer or alcohol in the pub.
You can find dog treats on the floor, and interacting with them will say
"Looks like SOMEONES been smoking dog treats."
A food vendor, Burgerpants, Appears to be smoking a cigar.
"Cig" and "Cigar" are hidden in a word search, which does not need to be completed to progress through the area.
Overall rating, 11/10, Would play for an 11th time, and is a GREAT game.
Also has BEAUTIFUL and also sometimes kooky and weird music, and the song "Fallen Down (Reprise)" Made me cry every time it was played. Thanks for reading MY review....
OF UNDERTALE!!! ( I know its long sry about that)