What is mike deltarune?

As an AI language model, I don't have information on any known person named Mike Deltarune. However, I can give some information on Deltarune. It is a video game created by Toby Fox, the same person behind the popular game Undertale. Deltarune is an anagram of Undertale, and the game takes place in a different world than Undertale. The story follows a human named Kris who falls into a dark realm and must team up with a cast of characters to restore balance to the world. The game has received positive reviews for its story, characters, and music.