After playing Hildryn for a bit, I can say that she's interesting. Not great, but interesting.
Her Passive is possibly probably the best Shield passive I've seen so far. Coupled with the Synergy from Guardian and Taxon's Molecular Conversion Precept makes it quite effective. However, I would like to know the breakpoints on the shield gating, if any.
Balefire is a bit underwhelming, I expected a Secondary fire with it. Not saying the charge mechanic is bad, but it needs to be modded for which takes up space in a build. Not to mention, there's a lack of information regarding the Charge functionality, like does it increase range? damage? what exactly do you get from a full charge? is there anything to additional to gain from a full charge? Questions that need answers, I guess. If I were to change it, I'd reduce the Charge time by a bit.
Finally, Aegis Storm is...confusing. It has Decent CC, which is a plus, but why does it turn off or become less effective if I go higher than a certain point? and why can't I descend with the Archwing controls? Going up is fine with the Archwing controls, but down is not allowed? I think there was some oversight during implementation, since one Moa stomp or Enemy Ground slam sends you flying up with no way to return to a normal height where the power is effective without deactivating Aegis Storm entirely. Additionally, when I'm over a pit I just fall slowly into it even when attempting to fly out of it by holding Spacebar. Rather poor implementation here...
Overall, I'm liking Hildryn, but some of her powers are baffling in their implementation.
EDIT: I've tried other keys when dealing with the flight controls, no go on any of them. So it's something that was either omitted or just broken.