I got to the end of the game and was like, "Wow, that was short and didn't really fit the theme very well." Then the screen faded out and back in, and I saw the twist. Very nice, and clever level design to keep it interesting despite the twist. It made great use of the theme, too.
Unfortunately, I got in a death loop after falling in the water with the jumping fish. And that was fine, and I replayed the game and got back to the same spot again, but then I fell again (after getting a bit farther) and got in the same loop again. I'd love to see the rest of the game, but I don't really want to replay it a third time just to potentially get in that same loop again.
All that said, even from the bit of the game I could play, it looked and felt great. The animations on the knight and goblin especially were top-notch, and the platforming felt very good. Solid submission.