This is very Loudo and Kerche, and that's a good thing. I like the ambitious premise you aim for, though unfortunately, time is not in your favor. The visual direction is quite strong, albeit you can tell things fall apart as you're dying to make it to the finish line, but that's understandable. But the very little scenes there is, they are made very strong impression. Should've kept the textbox floating to give stronger artsy aesthetic.
My biggest issues are two: 1) While the idea of clashing the world of play pretend and the real world is bold, it doesn't sit right with me when most of the "plays" are narrated instead of, you know, acted. I guess that's why it's very amusing when the director breaks the barrier between the worlds, which feels like an actual thing in a stage-play. 2) I understand you set up an ambitious goal of creating a story within the story, but there is some disparity that I can't really put my finger on. The Crni & Bella scenes - back and forth with the off-stage scenes - were smooth. But the three brothers... I guess one of the factors is that we never really get to interact with them as men, not the actors. As a consequence, you had to establish their in-play characters well, but it did not quite land at the right spot, especially with Basil "the Smart". There is more of the narration and "less of the three brothers".
Nevertheless, I can't wait to see the whole picture you want to paint. So chop, chop, get that kitten back to the dungeon!