Update v2.2:
update: train part with huge gap you need to avoid by going on the side. It is now clearer that you need to go on the side.

Update v2.1:
update: Memorial system menu is clearer. Memorials are indicated in the menu in the same order as the level.
update: Validated memorials are visible in the world (in gray)
fix: issue with some achievements in the first section of the game ("timer" and "no fall")