simply incredible, excellent all the way through! the game's core mechanic is very simple and through that simplicity is where the puzzles shine through. the pacing of the game is very nice, with a healthy difficulty curve that exercises the right amount of complexity given the current point of the game, which allows the player to further learn and apply their newly gained knowledge! the mechanic also is able to branch itself out nicely with many game mechanics that compliment its core perfectly! also given the nature of how the game works, there aren't that many different permutations of a given puzzle's state, so although it can feel complex, one can deduce (or stumble which is fine as well xd) the solution based on "paths" that the player hasn't explored yet in terms of navigating through the puzzle, which is always nice in a game like this!
the presentation of the game is also great! the pixel art is looks really good given the bit resolution that its on, and is also very clean and communicative which is very important for puzzle games! the ground is a good black to distinguish impassable collisions, the moveable walls are red with black dithering which makes it both pop out really well while still feeling like a part of the environment, and the character is a good white which also pops out against the darker colors. even then the backgrounds still have really good visual flare with its use of geometric patterns without being visually noisy, its just really nice to look at! also the audio is really nice and provides good feedback for any of the interactions that occur in the game!
i had a lot of fun playing this and was engaged the entire way through! great work!