I've played through the tutorial and the first World. Yep, it's more Boxboy! That's all I wanted, and I got it.
Quick deets: -- If you got the special costumes in Boxboy, they carry over to Boxboxboy! There are new ones as well. -- You can also buy little comics starring Qbby. They're cute. -- The game does indeed follow the grand conclusion to the first game's story. The epic tale of Qbby continues.
I don't even remember how the first game ended. Not that it matters I'm sure But yeah, more BoxBoy! I did a couple of worlds this afternoon and it's fun. Simple but fun and I expect it'll get hard later, much like the first. Looking forward to playing some more!
It's crazy how taking a break from a stumper and coming back a few hours later can help make the solution seem obvious in hindsight. I've done that like a dozen times throughout. So close to finishing the Final Extra World...the final part of 16-7 is tough to squeeze through. I've managed to pick up all the crowns so far, too, so 100% completion is close!
Took me a bit over 11 hours to finish, which was about the same as the original Boxboy. That sort of confused me, because I felt like I had a much harder time with Boxboxboy than the original. I booted up Boxboy, and it looks like it has more stages than the sequel does. But I think Boxboxboy's difficulty curve starts elevating much earlier than Boxboy, so I guess it makes sense that it would take longer to get through fewer stages.
Also, I completely forgot that the final bonus World in Boxboy actually uses the dual-boxes gimmick, so Boxboxboy's gimmick isn't even exclusive to it, haha. It definitely uses the gimmick to much better effect, though.