Undertale Fight Simulator (Create Your Battle !) by NutelGame

Undertale Your Battle - Colaboratory

Game Jolt - Share your creations

Undertale Battle System UnityTutorial

Orikaru - Undertale battle simulator

Pixilart - Undertale Battle Template by FatalErrorAlt

Undertale battle simulator v2

Game Jolt - Share your creations

I made an Undertale fighting game! It's called Brawltale and it took a lot of work over a long period of time, here's some screenshots from the game and if you're interested

Undertale Fight Simulator P1: Frisk

Undertale Fight Simulator (Create Your Battle !) by NutelGame - Game Jolt

Best Undertale Games - Game Jolt

Steam Workshop::Toriel Battle (Undertale)