arrow keys to move space to see what phase you're in avoid gaster and his hands, even when they're not attacking you (his speech bubble hurts you too...)
this takes place right after the pacifist run on the surface, and gaster feels he is the only one that didn't get a happy ending and absorbed the 6 souls to make you pay for forgetting him. HAVE YOU HAD ENOUGH YET??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????