I very recently snagged this on eBay. It does play Solo. Hopefully I'll get it to the table within the next couple of years. Image Source: BGG
I have it New In Shrink, and I have tried to sell it for two years... If it's good, maybe I'll try it? But it's worker placement.
(Dinosaur Island + expansion + Duelosaur Island was actually one of my very first ventures in KS. I didn't know my tastes then, I only saw the dinos meeples. But there are none in Duel!)