Is this game going to be a choice based game and is this REALLY similar, some elements, or not much like Undertale?
There are going to be choices, yes, but not the same kind of choices at all as in Undertale!
I'm taking things I like from Undertale, like the character-driven encounters, the overall structure and pacing, a whimsical and mismatched aesthetic, occasional creepiness, and DOGS, but using a totally different art style and a completely different story.