I think he's trying to say he's sold on Episode 1, but that Episode 1 will have to sell him on later episodes released. That's certainly my condition, too.
I don't like what Dimps has done with 2D Sonic. Stages were forgettable, as were enemies and hazards. It's better than some of what we've seen before, but still, it doesn't interest me all that much that Dimps is developing. This video, when it's functional, looks to be almost a hybrid between the stages you see in Dimps games and Sonic 2: There's unique enemies, with a higher focus on platforming and quick reactions, but often, there's only one pathway. That said, I can't exactly judge it based on these things, because it's clearly far from complete.
Anyways, I'll play Episode 1, and see where that gets me, but I'm not sold on more episodes.