I rarely ever come to /m/, but I checked here cause there wasn't a thread for this show on /a/. Wow. This thread is not amazing.
Anyway, I liked the first episode. I don't think it was as good as the first episode of Gridman, though. Felt it could've used a few more minutes to have things breath a little, especially near the end. Kinda felt the same way about the first ep of Gridman, though. The way that show had Utsumi declaring themselves the Gridman Alliance, and Rikka rushing off to go find her friends, as the credits rolled. It's like they were being pushed out the door with the run time. Here, with Dynazenon it seemed more noticeable, though. The fight could've been a little longer. The time between the start, and the transformation into the dragon form was pretty short. Just needed some overall breathing room.
Still interested, though.