It's a simple trick of seamless room switching that I learned from Midnight Dungeon, you can download code and open the game in Bitsy to see for yourself. Smoke and mirrors. :)
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Yes, you can use It in a commercial project. I don't think there's a specific license in this pack right now, there was no need so far.
You can contact me via e-mail to clarify any details ( kac.wozniak[at]gmail.com ).
My name is Kacper and I'm a pixel artist / IT student. I knew about Superpowers from Twitter but didn't try It out until couple of weeks ago. The fact that is a HTML5 game engine with such a nice editor, open source code and amazing potential convinced me to give It a shot and I'm very happy with that.