Undertale is fabulous. I'm not really sure how much hype it's been getting, but the game has already risen to be one of my favorites. Definitely in my top 5 games.
Complete all three routes (And play the pacifist after genocide to get a different ending as well). It's totally worth it. The Genocide route is hard to do, but the detail is just amazing. It makes you fill like the terrible scumbag you are for killing all your friends.
The soundtrack is also amazing, and if you haven't you ought to listen a bit. Perhaps the greatest soundtrack made by a single person ever. ASGORE, Heartache, Spider dance among others...
Also, Asriel is sort of the most adorable thing ever.
"...But you were washed, you were sanctified, you were justified in the name of the Lord Jesus Christ and by the Spirit of our God."
- 1 Corinthians 6:11
I put coffee in my coffee