First of all, this is not a game, it's art, don't treat it as a game.
The theme of this game is identity and I believe society as well. I think that what this "game" is supposed to convey is that everyone is different and if you go in this world trying to find someone just like you, you'll burn your identity. The circle at the end may symbolise an isolated empty vessel, without an identity, looking at the colourful people without any hope of reaching them.
This is just my opinion, it's subjective and I thought of it in about 10 minutes, I hope the author share's what meaning he hid in this submission.