Prism Indigo DX has been patched to v1.7.1. This fixes a dialogue mistake that, rather embarrassingly, was displayed in one of the screenshots on the game's Steam page without me noticing it until two days ago. (Mind you, at least nobody else noticed!) I also made a few other small tweaks while I was at it.

V1.7.1 Patch Notes

Changes

•   Improved the look of Prism Amber’s shield
•   Updated a few achievement icons that still used the pre-1.2.0a bullet sprites
•   Updated the name of one of the Sound Test songs to match its name in the Soundtrack DLC

Bug Fixes

•   Fixed one of Prism Amber’s dialogue lines being incorrectly attributed to Prism Indigo