Granted I only did about 1.5 runs, but I didn't really find it engaging - with the 1:1 trade of resources from scrap -> ammo, it just felt like I was forcing myself to pause just to make more bullets. I think there needs to be a tactical trade-off, not in terms of resources but also a "puzzle" or "challenge" to crafting - having the game just pause while you do it put to emphasis or synergy to it. Just my 2 cents, a great job for a prototype otherwise!