Well, there isn't any "goal" in the game. You just carve things out of a log with a chainsaw and that's pretty much it. You can either use the references and try to match them as close as possible or you can carve something out of your own imagination and that's pretty much it.
So yeah, there isn't anything like a mark or a grade after you carved a shape, there isn't really an ending condition at all. You just restart with a fresh log or close the game altogether when you feel like you got everything it has to offer.
On the other hand you might be experiencing a bug with a log completely disappearing right in the beginning - in that case I completely get your confusion, but I'm afraid we can't fix this technical issue at the moment.
Anyways thank you for playing and leaving a comment!