I finally looked at the title, good luck. Pro tip: in most attacks, using the arrow buttons helps more than using the joystick. Also, unless you absolutely have to, wait until the “Sans is sparing you” section in phase one to heal, as this is a break section. The phase only progresses when you attack so healing adds an extra turn to the phase. Lastly, you WILL die on the Gaster blaster circle a lot. I fought sans for a 2nd time recently and half of the times I died (attempts 3, 5, and 6) on that attack. Everything else was just stupid slip-ups in phase 1