Found the Orange Island easter egg, (Btw great job on the visuals you guys nailed the feeling of Orange Island) but I was a little upset when the only payoff was the crown at the end. The first boss is okay in terms of difficulty but could be just a little faster. Also, the music. You guys nailed the music. It's a sound I've never even heard on the GBA. Very Steven Speilberg kind of vibes. It's been a pleasure to play the demo overall, can't wait!
I'd just say for little side quests like that you just give cosmetics. Whether it be just a color swap or letting the player play as Bones, (I really like Bones, he's my favorite! Was sad he didn't have a spot in the demo ): ) Like there, you could've given Maxwell an Orange spacesuit, because, you know, Orange Island ;). Just the little stuff. That's all.