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.
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