Great little game you’ve created here, packed with content in such a small book.
Some comments:
Not having an attack roll, with everyone always hitting, doesn’t seem like a good design choice. That’s where suspense and part of the fun lies, in those moments where someone’s about to die but they get saved by a miraculous hit or shot. By not having this you’re losing this and placing it all on the damage die, which is a guaranteed roll if you attack. The satisfaction of getting better at combat (not just an increase in hp) is also lost by going down this path.
Light armour (1 AP) and heavy armour (also 1 AP):
Light armour includes a shield. What about heavy armour with a shield?
I’m going to run it with these house rules:
Opposed attack vs defence rolls, combatants add a level/HD bonus, damage die are exploding. Light armour is 1 AP, heavy 2, shield 1. Armour is ineffective/bypassed on attack rolls over 16.
Cool little game, I hope to see some supplements and adventures in the future.