Got the artefact after 10 days, I hope I didn't miss any journal entries... the last one seemed a bit like a last entry, but I don't know for sure... was a neat story that accompanied this game. I really like how you can manage your moves such that you can (almost) always get the first hit, just by putting in some effort in finding the right location to fight.
At first I was really confused as to why the upgrades didn't work, but that was just me reading the numbers wrong, interpreting an L as a 1. The font fits the game, but also makes this an easy mistake to make.