The production value here is really fantastic. Everything looks clean, including the fully animated cutscenes for several of the sequences (some, like the way the can or fat guy roll, really show off incredibly smooth realism on a level that not too many animators here are capable of.)
Beyond that, I found this actively difficult to get through. The environment is too big (and the game is too long) for the kind of precise pixel hunting needed to gather everything, and only a handful of the puzzles are telegraphed in a way that makes sense. I ended up using your walkthrough perhaps 3 times before giving up at the final code at the end (which I had absolutely no idea how to find on my own and didn't feel like skimming the whole walkthrough for.)
I think one of the biggest things that makes this game less fun than the old escape room games (and this is generalizable to all of the point and click Riddle games, not just this one) is that unlocking more rooms as you progress makes the game drag on and on, instead of giving the player a small and mostly complete set of problems which the player is able to solve one at a time. You pixel hunt, use trial and error on an absolutely massive number of clickable items, finally find the combination that works, then unlock a new area which requires more pixel hunting, trial and error over a larger area, and backtracking over a larger area. The longer the game goes on the more tedious it becomes, leading to an experience where I found myself hoping for the game to be almost over for pretty much the entirety of the experience.
Having some more hints to guide the player, or perhaps just blatantly showing which items were clickable, would have made this experience feel a lot less frustrating. As it is, the time you spend stuck does make the game difficult in a sense, but it's the kind of difficulty that can only ever feel frustrating because there's no real way to "try harder."
As a closing note, I really didn't find the flavor text (or the general premise: "escape the school") to be terribly interesting, which meant I was only interested in completing the game for the sake of completing it. I wasn't invested in the characters, the plot, or anything that would make me anticipate what I would find deeper in the game.
I do think this game probably succeeds at doing what it intended to accomplish, but I personally would have had a much better experience with a shallower "choose your animation" game, or perhaps a shorter game.