author=AceTrainerJim
I downloaded and played through this episode yesterday. This was a fun episode, though I was a little disappointed that it didn't seem to have a "real" ending; there wasn't really a "final" level or a "final" boss. But the real reason for this post is that during my playthrough, I found some bugs:

-Shroom Sanctuary's music file is missing. The music file name in the editor was "Sonic Gen-Mushroom Hill Act 1.mp3".
-Greenhouse Garrison and Rainy Towers each have 2 stars according to the level hub, but both levels' 2nd stars are completely inaccessible. Greenhouse Garrison's 2nd star is in a blank room in Section 4 on an unchecked layer named "Win", but there is no way into the room. As for Rainy Towers, its 2nd star is in the same room as the 1st star, on an unchecked layer named "Star", but there appears to be no way to trigger this layer's appearance. And even if that star did appear, it wouldn't work properly, as you can't have 2 stars of the same type in the same room. I'm guessing both of these levels abandoned or forgot about their bonus stars?
-Greyocean Spiral crashed before I could even play it. Upon further research, it turned out that the warp path and the level file name weren't the same, as the warp path had an underscore between Greyocean and Spiral, while the level file didn't.
-The start point of Foggy Ferry Fortress was placed right next to the boss door.
-All of the Dry Bones in Brimstone Barracks were placed inside the floor. This resulted in one falling into the lava before I could reach it, and the other two sliding through the floor.

So...that's all from me for now. I was looking forward to this episode for a long time, and I'm glad it finally got released!