I played this game for much longer than I was expecting. Has an addicting charm to it. I would have liked to see some more dynamics elements as the game progresses. My feedback would be to try and add different structures in the game that exhibit different behaviours from one another, such as something that generates over time. As said in other comments, think about how the game scales over time and how the player should change their mindset throughout the different phases in the game (early to late game). Lot of potential here, great work.