>>717213135
I see it more like Gaster also is "foreign" to the Deltarune world. The Prophecy references "To save the WORLDS" not world, worlds, plural. Assumedly whatever shit is happening is so bad it threatens other universes/timelines, which I can only assume the guy blasted across spacetime would want to prevent. Hence "making a *new* future". I think it's less Gaster limiting our Determination, and more just our Determination struggling against the prophecy binding the Deltarune world. I think Gaster is betting on our Determination being able to win out and prevent whatever tragedy is gonna happen.