Yes, you can play it like you've describe it. More game modes are coming (in Steam Early Access version). Also, if you want more progression (with army management elements), there will be Castle Mode later on. Check Steam for more info about game's future
A member registered Aug 25, 2018 · View creator page →
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Next version will brings ability to change graphics quality, so you will be able to lower graphics. Currently game runs on the equivalent of High Quality settings, so it can be a problem with graphic card.