Not much, but my idea of a Guyver video game would be based on Agito's Zeus Thunder Bolts and have it first person shooter circled around a non canon ex military character. Something like that, where you can use a variety of guns. I'm not sure about the location and not sure which zoalord. I haven't thought about it in that depth.
Although using Guyver powers + Gigantic would make you imbalanced. Kind of like how Neo, Morpheus, and Trinity were too advanced for past Matrix games on the PS2.
Also, have a variety of Chronos enemies using guns and transforming into Zoanoids as well. I think it'd be a cross between Doom, Call of Duty, Resistance: Fall of Man and Killzone.