I like this! I feel like I came to it pretty late as there were already quite a lot of useful notes, but not so much in the way of supplies. I hope my journal helps future players as I think I may have stumbled across something important.
This is kind of picky for something that was made for a game jam, but I'm not a fan of the "click on a weapon item to use it" style of interaction: at one point I ended up guzzling a whole bunch of energy pills instead of stabbing a zombie because I hovered over the wrong thing while looking somewhere else. I think it would be better to drag weapons to a left hand or right hand slot and then left or right click to use the relevant attack.
The tutorial also feels like overkill. I wanted a quick look just to check the controls, but ended up locked into a lengthy (and as far as I could tell unskippable) sequence that went into way more detail than I found necessary - especially as much of what it explained seemed apparent just from poking around in the game. The whole thing feels pretty intuitive! Because of that, I think you could get away with just a little "cheat sheet" - perhaps with more detail available behind a "next" button for anyone who wants it.
Those are trivial complaints, though. All in all, this is a pretty spectacular result for two weeks of work!