The gameplay ended up being deeper than I realized at first, so I had multiple playthroughs to fully figure out the mechanics and strategy. I agree with everyone else that it feels slow to start out, but with the upgrades that ends up working out pretty well :)
Maybe a tad too reliant on how much gold is near spawn, and how close it is (if you get enough for an upgrade right away, you’re basically set), but otherwise really good, well done! Oh and hotkeys for upgrades would be a really nice feature and flow well with the quick gameplay