Maybe 9 Bit Armies? I feel it’s more similar to C&C than RoN, but I loved the heck out of RoN back in the day and 9BA is pretty fun. The battleships are a hoot, they hit really hard and have range for days, which combines well with the destructible bridges.

Edit: Whoops, did not read closely enough to see you’re on a Mac. 9BA might work, this person seems to have had luck https://www.reddit.com/r/9BitArmies/comments/1azi3ow/how_to_play_9bit_armies_on_macos/?rdt=53318

There isn’t a historical element in 9BA but you do get air & naval units

Rock and stone!

Maybe check out Roboquest? I was looking for a mindless FPS a few weeks ago (my usual go-to is UT2004, I’m old :]) and the Roboquest demo scratched the itch pretty well. Planning to pick up the full version when I see it go on sale