in the end I had to rush the game a lot so it ended up being a bit confusing.
About the 2 bars, the 1st minor is cold, the 2nd is life
To use items they have to be in the 1st space of the hotbar, the bonfire to put on the ground has to be in the 1st slot and click with the right button
To move it is a drag&drop, the item does not appear after picking it up, but you can drag it to another slot, if you send it away, it throws it away
It was supposed to have an enemy, but he only appears once at the beginning (I forgot 1 line ,_)
and has more than 1 way to climb to the top
I think I answered everything