Hey, tried to check it out, but now if you start a run it crashes into console.
I will check out your other game references, since i dont know them. I like the concept of your game and the army feeling to conquer something.
Its just my feeling, but these time based games are popping out like crazy and your game feels like it can do something unique,. I understand that you want a limiting ressource for the runs.
Just some ideas:
HP and Defense Upgrade for survival and limiting factor - Just had this idea after you start entering lich teritory and there are arrows come flying and it was like "oh man would be brutal if they oneshot my units". Like you could make a whole barrage of arrows to gatekeep until the units are strong enough to survive the shots.
Levels for individual units, based on kills or like a verteran status - since some units storm ahead like a hero it would be funny to see them level up or something as attention retainer.
Lane Switching units - i really liked the vampires coming after your units. Would be funny to see some Tanky shield guys sidewalk your units and be like "your shall not pass"
Best Regards!