I like this game partly because of how accurate the title is: "this is not a minimalist game." Even though there is almost no gameplay to speak of due to its simplicity, I love the theme of slowly increasing complexity in a minimal world, which encourages you to explore every option possible.
But of course, the message that you wove into the ending was my favourite part; it makes you think about your own perspective on things. Well at least it reminded me of how my perspective can still be incomplete, even if it's superior to someone else's. That's what I got from this game, even though you might have only meant it as a humorous quirk to an otherwise random and meaningless game.
I did also enjoy the humour, though. I was laughing straight from the start with your reply to the wizards: "with your head it makes a 100". And of course the conversations with the square guy.
Even though you only had a very limited amount of time for this game, I would like to point out one quirk I had, which I think you could have covered somehow. When I started playing the game a second time, I went into the square quarry, got 3 normal squares, and then went out and back in again, and got 2 more normal ones. Then I went back to the guy in area 1 and handing him 5 normal squares didn't work, which is a bit of a hole.
I was wondering why you let objects regenerate in this game. I was assuming it was something of an extra feature for more possibilities, but seeing as it doesn't change anything, I'd say that you could have done without it.
So that's my only problem.
PS. from a story point of view, how come the red squares appeared in the wizard's curse-world in the first place?