Children of Time is a 2015 science fiction novel by author Adrian Tchaikovsky. Similar idea; in the far future, an exhausted Earth sends out a fleet to try and terraform exoplanets. Problems arise...
Bugs. It's bugs, lots of bugs. Super unique concept though.
In a dramatically less serious series with a similar theme, that's very aware of its cheesiness is The Galaxy's Edge series. Military sci-fi series where humanity has populated the galaxy using FTL tech developed 50 years after the richest and upper society tech billionaires/politicians abandon Earth on their own generation ships they used to dupe the rest of humanity to not bring them. Flash forward to current times and their generation ships are slowly catching up with the rest of humanity who leapfrogged them 6,000 years ago and they're the "Savages" now having done space Nazi experiments on their shipmates over the thousands of years in the void, while the rest of us built a galactic Republic.
If we have giant bugs why stop there? I mean, what if the bugs aren't gigantic at all but they are proper bug sized to the intelligent aliens out there and it's a human skill issue for being smaller than bugs? /S