Ahah! Thanks for your comment :D
I was the first to be surprised, but I'd already created most of the game after an hour and a half and couldn't believe it myself. I have to say that the visual minimalism really helped. But the music is also very simple, and it only took me about twenty minutes to create it, I think. Anyway, I was able to spend a little time at the end of the creation on the visual effect of the border (which I hadn't planned at all, but which was suggested to me in the chat during the live creation).
As for the particles, everyone seems to agree with you xD, I'll think of a way to correct that.