Undertale is a recent indie game by a guy called Toby Fox, previously a contributor to Homestuck by way of music. (Full disclosure: I thought Homestuck was a webcomic, and didn't know it somehow had music, but that is a different topic altogether.) It's a puzzle- and dialogue-heavy RPG with turn-based battles, in which you dodge enemy attacks by playing a tiny little
Touhou, and can also talk your way out of any battle. The dialogue and presentation are very clearly Mother-inspired, and it's funny throughout.
It's on the page that I linked, but here's the trailer for the game again:
There's a demo available on the website that consists of the first dungeon and boss. It takes about a half-hour to play through, so you can easily see if the game is to your liking. I haven't finished the game proper myself, but reports are that it's about six hours long, and also has several different endings, making replays a non-tedious thing to do.
I recommend you check it out!