Just a suggestion, why not add the ability to make a musket later on? I love this game mode but it just seems like your not advancing in technology, you only make more items of your current era. For example, to make a gun you must have metal bars (of some sort), however you must make the bullets (so it's not ridiculously spammed), the bullets can be made via gunpowder and lead. (Lead can be mined, and gunpowder can be made by sulfur (Found near volcanoes which can also be added too!), charcoal (Can be produced by putting dead animals/whatever in a kiln and heated with the lack of oxygen), and finally potassium sulfide (which is created when potassium and sulfur are mixed, potassium is found in dissolved seawater.). It is a complex process but can be worth it for a 100 damage a bullet musket. (Would make hunting tons easier and also keeping enemies away)