Blocage entropique / Entropy Block

I have made a new (puzzle) game, and I am rather happy with this one! For those of you that know the film Tenet directed by Christopher Nolan, this is pretty much Tenet: The Game. Although it is called Entropy Block (Blocage entropique). The main focus is time and time paradoxes.

This was made for Mini Jam 110 (the votes are still open for some hours); actually, this time, I did make it in about three days, but unfortunately, I started late because of two things: a yearly festival, and… learning how to use Ct.js to make the game! I think this was the first time that I wrote actual JavaScript. I intended to learn the language, so here you go.
I may write more extensively about Ct.js, but for now, I will just say that it has its strengths and weaknesses. Its somewhat POO-ish orientation is detrimental in my view (bits of related code everywhere!), but that is a story for another day. The great boon is that I was able to publish a Web version! Help yourself to it.

I am happy with the (subtle!) mechanics and how the difficulty plays out; I think it is already a rather hard game, and you could make nightmarish levels. The concept is of the kind that can twist your mind.

There was one bug (at least!) in the first published version, which I solved shortly thereafter. For the curious: the tiles were still marked with the buttons from previous levels, which is why there were ‘phantom’ effects on lasers and laser selection screen.

Transferring the original related notes below for reference.

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• Apparently, the lasers can sometimes activate themselves without any reason; this happened to me only in levels 8 and 13, but only once for each. Weird. Apart from that, the game is perfectly playable and all levels are finishable (even though you can skip any you wish). (Well, I do not remember how I solved the last one, which was before buttons were implemented, so there is a slight doubt about level 16, but I think it should be solvable. Funny that I am stuck on it; the difficulty curve might be about right!)
• Another weird small bug caused the laser selection screen to be brought up while only being near the OFF button instead of right on it. This is, again, very weird as I do not use collision detection, but exact coordinates; perhaps some jaggy blackbox by Ct.js can mix it up in some frames?? I could not tell.