Absolutely agree with your feedback Dargenus !
#2 : it is pretty infuriating indeed. I’ve spent 15 to 20 times using the flattening tool, just to eventually give up, the slope wouldn’t go away. I like your suggestion of adding the flattening cost to the work amount. You’re citing AoE IV, I’ll cite Workers & Resources : Soviet Republic, which is doing the same, as long as you can pay for it.
#3 : that’s something that striked me when I first saw playthroughs of the game. Buildings should be able to rotate/be placed diagonally. Additionally, I’d love to see curved walls. It’s such a pity to have roads weaving around the town center, and suddenly, we’re locked with right angles when we want to wall our gorgeous city. It does brake the immersion quite a bit !
I’ve commented on this in another related thread : Diagonal und Rund bauen! build diagonally and round!
A big +1 to all these suggestions.