This game is great! If you put some more work into it, it can easily turn into a returning game. Ofc this game has lots of potential and so many things that you can do with it, but here are a few suggestions:
1: Make it possible to get more resources after you run out of the pre-generation ones
2: Make a survival mode where the enemy just keeps coming.
Things to think about in the near and far future:
1: Ofc... more units
2: The possibility to play as spiders instead
4: Give the spiders a base, as long as that fortress stands the spiders keep respawning
Im probably way to late, and this project has already been left for the dust, or given up on. But just lettin ya know, I like this game :)