Is This Undertale

Overview
Is This Undertale is an English Undertale/Yume Nikki fangame created by Reptiny for Dream Diary Jam 3. It was developed in GameMaker: Studio.

Gameplay
Is This Undertale is a traditional fangame. Instead of effects, the player must explore and collect the six hearts hidden in the various worlds to unlock the ending.

Plot
You play as Frisk from the original Undertale as they explore the world around them.