sounds like banner saga didn't need a ps vita port so much as it needed a vita re-implementation
https://youtu.be/OBsRPhCm5sU?t=899
The Vita and the PSP both have a lot of tactical RPGs that are a lot higher in complexity, with actual 3D environments as well as randomly generated ones (much harder to handle than pre-made hard-coded ones).
Compare with best-in-class on that platform: https://youtu.be/nUhspS9VddQ?t=3539