It's great that you noticed😁. Yes, I started developing games with Godot around April of last year, and after each jam I participated, I always transform some of the assets into frameworks (e.g., UI transitions, menu systems, dialog controllers, shaders, etc.). And I always end up reusing and improving these assets with each game I make with them. However, I never reuse core game mechanics or complete art assets, as a way to maintain the spirit of the jam! 😊
Regarding the strategy, I think that's the strongest one, the only problem is that cheap units are very easy to be converted by the other factions, so they can easily turn against you, if you don't have enough defenders to keep them on your side!
Edit: Feel free to reach me on discord in case you want to discuss gamedev stuff!