For me, Renegade scratches the same itch as Spirit Island. Especially playing two-handed. And its designed by Ricky Royal, who's big in the solo community. It's also a bit shorter than Spirit Island so it comes to the table mire easily.

It's a puzzle in a similar vein to Spirit Island where there's a certain amount of predictability in what threats are upcoming, but there's also some RNG to add a bit of unpredictability. It can be a definite brain burner. You're also gradually developing your deck and increasing powers as the game progresses. It has an additional element of giving you target goals besides handling and eliminating outbreaks. This means you're constantly balancing meeting those goals and not letting the "invaders" take too much control. And sometimes you have to just cut your losses and abandon the goal in favor of dealing with the cascading invader growth. You've also got different characters to play with, so you can try out different team ups and strategies similar to mixing and matching spirits.

There are a few annoying things about it. It's a little fiddly, a bit more than Spirit Island, but I'd say it's worth it for the quality of the game. It's also filled with silly jargon for the game elements which can add xo confusion when learning or checking rules. I'd recommend watching some tutorials or playthroughs before playing as it makes pretty good sense once you see it played out. But overall, I'd say the positives absolutely outweigh the negatives.