Clever and well executed game.
I think it was a shrewd design choice on your part to set the game entirely on the overworld.
I have utilized this trick myself before and it saves a massive load of dev time not having to construct walls and separate rooms here, there and everywhere.
I felt like the balance of the encounters could have swayed to being a little more difficult. The enemy design was quite intimidating but I found that I always had a surplus of soldiers left over and so I went from initially fearing these towering grotesqueries to a feeling like I was hunting them down like I was the alpha instead of the other way around.
Of course this is just my personal preference and experience. I am sure I am probably in the minority in that regard and that others thought the difficulty was right on point and more balanced towards the player so I do appreciate that as well; it makes the game more accessible to a wider audience.
This is a cool experience that I encourage everyone to play. Awesome job and thanks for submitting!