Hey, thank your for your ideas!
To 1: This will be in the full release. You will be able to change the behaviour of a selected unit.
To 2: Interesting idea, but the health is quite unrelevant because most weapons are one hit.
To 3. Already on my long term list, there will be more biomes.
To 4 + 5: I'm still not sure wether I want to add mosters/fantasy units to the game, but I write any suggestion on my list to decide that later.