For those wondering, I am building this in the Unity game engine. However, I will not be starting completely from scratch. Last summer, I decided to build a different Undertale fangame by the name of Luketale, for my friend, Luke. Videos of that game can be seen here: https://www.youtube.com/channel/UCwICE1-Uyif19bwpCvHsAMg
So, anyway, I’ve got pretty alright base to work with already. Obviously, it’ll still be a while before I finish the game, but I’m already ahead!