Personally, I don't think I would honk my horn if I was driving through a demolished city and came upon a giant standing in the middle of the road. It would just seem...unwise.
Of course, even if I were 15ft. tall I don't know if I could knock down a skyscraper just by punching the ground next to it a few times so maybe giants aren't all they're cracked up to be.
All jokes aside I did enjoy your game. TarraIronWolf has some good suggestions but here's my two cents:
1)There needs to be harder cities, or a larger city, or maybe just weaker upgrades. By day 3, with 2 regen upgrade, 2 health upgrades, 2 strength upgrades, and 1 healing skill, I was literally invincible. Not only is the game not challenging if you take less damage than you heal, once you destroy all the buildings there really nothing to do except laugh at stupid motorists and commit suicide by cop.
2)The buildings are really at the heart of any city destruction game, on way or another. Here, although they were worth a lot of point, they weren't all that interesting and the funnest thing to do (destroy them while climbing on them) emptied your stamina bar. I'm not suggesting you rampantly rip-off Rampage but I think it would be cool if there were more things to do with the buildings. Get on top and bad at airplanes for example, oh, no, wait...
3)The cars, too, I think could be used more thoroughly. I really like how when you destroyed a house a person came out; maybe some of the stopped cars should have people fleeing from them too. It might also be nice if we could pick-up and throw the vehicles.
Hmm, reviewing my review it looks like I'm just telling you to remake Rampage, which isn't really what I meant. But, hey, it got relicensed several years ago now and there aren't any copies (readily) available on the internet anymore so maybe there's a niche there. You're already doing a good job and seem to be enjoying it so maybe I should just leave you to it and stop rambling.
P.S. I loved the birds