If by the difficulty-based "True Ending" you mean the part of the description where it mentions this game following from an alleged "True Ending" of the first Echo, then that's just a joke; the original "Echo" visual novel that this game was based off of doesn't have any kind of "True Ending" to speak of so there isn't anything to worry about there. It's basically just a gag about how this fangame doesn't follow on from any of the "canon" events of Echo without having to break kayfabe.
The second part is definitely a glitch though; I thought I'd caught all of those before I uploaded but it looks like there was one I missed!