Thanks for playing and reviewing, I think I'll end up expanding the game after the jam to address some things players bring up in these reviews and add some more things I hoped to include initially. If you're interested in trying future changes follow my itch profile and I'll keep you informed.
I didn't explicitly explain some of the game mechanics to create more discovery in game, but since you asked about the map and guards here's some info:
The map shows an overhead view of the tower you're in and the surrounding area so you can keep an eye out for approaching ogres.
The guards allow you to sound an alarm to kill and ogre that gets past you before it gets to the village.