Hello! Welcome to Feedback Quest 8! My name's Hythrain, a co-host and one of the streamers for this event! This feedback is being written live as I stream your game! If you're interested in seeing my live reaction, let me know and I can send you a link to the VOD once it's posted to YouTube!
So my normal approach for any game in these events is simple: I get the game, make sure it's not a virus, then play it with as little information on how to play as possible. This way, I can judge how intuitively someone can figure out the game. Only if it's obvious that I need to read more will I do so. I note this so you can get a sense where some of these feedback comes from. In addition, I want to note that feedback and rating are different; don't use this feedback to gauge what I'll rate, nor should you view my rating as entirely indicative of my feedback.
This was quite an interesting concept for a puzzle platformer. If I'm being honest, I think it's biggest issue is just how slow it can be to move blocks along and how easy it can be for the player to mess up. When I was doing the puzzle where the floor was mostly red and I had to shift blocks on the ground along, the movement was so slow that at times I'd forget that the tool for moving blocks wasn't bound to the character and thus I'd forget to move my mouse... then swap a red block to be right under me and I'd restart. Meanwhile, certain parts (like dealing with the final level) just felt slow because you had to move so many blocks ahead of time to even solve it.
There are two improvements that I think can be made to the concept. First is to allow the player to change the size of the flipping box at their discretion, ranging from a 2x2 box to maybe a 5x5 box. That way, the player can make larger changes should they desire. The second would be to allow the player to make swaps vertically. The best way to achieve this would be to give the player a control to change it then have a set of arrows appear on either the side or top of the grid box depending on which mode it's in: arrows on the top pointing to the sides would be for horizontal movement, while arrows on the side pointing to the top and bottom would be for vertical movement. That way, you can expand the gameplay into more and create new puzzles.