This game is hard! But not overwhelmingly so; I think there's a number of bugs that prevented it from being a really sleek experience - sometimes my dudes would get hung up on trying to deliver minerals to a depot, sometimes (it feels like) monsters would be just immune to damage (no feedback will do that to a player - they'll be assuming the worst crimes on the game's part). And having each depot its own separate counter of minerals for when it's allowed to spawn, and having a TOTAL between all depots displayed in the screen was very confusing - at one point I had two depots and 39 crystals, but couldn't spawn from either of those :D
Also, it's a bit confusing that dudes are "bound" to a depot and when you're giving an order to attack a monster, only dudes from the currently selected depot would attack (and there's no way to select a depot WITHOUT spawning a new dude if you've got resources for it, but that's a nitpick).
DESPITE THAT. It's been a wonderful tiny little strategy game that I'd honestly play much more of once it's streamlined a bit (add feedback to the player, please! HP bars/numbers, sounds upon miner/enemy death, other game events) and there's a bit more content (the idea with the research tower, "prospecting" building that spawns/discovers minerals and the depot is nice, and there's definitely space for more!)
Congrats on delivering this game to the jam :)