Really appreciate you taking the time to write up detailed feedback.
Am planning to give more structure to the games opening - Possibly locking down areas and upgrades overtime so that players can both unlock them, and also start out simple and expand over time.
Having the game pause if in menus before an end of wave is a good improvement.
Right now each of the different stages all have a mostly similar enemy set, that is one thing will be greatly expanded on in the next few updates including new bosses for each stage and a few other tweaks to make them all unique.
Great point on lack of AoE or attack speed, will be fine tuning the balancing with each update and work on getting this just right. Some future upgrades will help like having arrows that split out and cover more area, and more AoE like the Bomb Arrows and new ones that have lightning and spread effects.
The Farming system isn't in the demo yet - but is coming, along with the Card collection (and abilities), Mining resources, Crafting, and a lot more. Will updating every week or so.
This feedback helps a ton, and added a lot to the development list - Thanks again!!