This game is great, we spent way too much time playing, it's really fun. The main issue is that the game gets really laggy after you have a certain amount of buildings so that in the end one ingame second took more than 10 seconds in realtime. Because of that I was unable to finish the monument since the required resources are way too high after buy the one that costs 50 lumber in my opinion, especially when the game runs so slow.
Really awesome game, I just wish I could finish it.
Edit: I decided to just build a base and let it run in the background to finish it. After that I think the resource requirements are fine if the performance is fixed.