It's hard to say if it's overpowered, especially in a dexterity game and with so little testing on my part, it's mostly just an observation. Not sure if it actually needs a nerf, but keep an eye on it.
As for the sunrise mechanics, if I run Squashbuckler again I think I'd want to make some tweaks, but I definitely enjoyed the concept and feel of a wave-based gauntlet.