Great demo. I found myself wanting more organization during night attacks, as they came up so frequently and sporadically that it just became a chore. Nothing too hard to get used to, but would be nice to preparation phase beforehand to give a moment of pause between mining and immediately fighting. Would be a great opportunity to situate ore ammunition? Unless I missed how to select ammo type, it hurts to see that stronger ammo used on all the weaklings in the beginning of a defense round, especially after upgrading to full-auto.
On that note, a function to change between other gear like pickaxes would be interesting. I don’t know how much further down you plan to let players mine, but having a single pickaxe being upgraded consistently combined with upgrades like drones or bombs or splash damage, there comes a point where it is impossible to not immediately drop through the earlier layers. Could interesting to add a preparation phase for mining as well, where one could situate their load out for the desired mining trip in mind. E.G. wanting to grab clusters of purple time gems in dirt layers without blowing up the surroundings, making it impossible to climb back up to them. Ladder? Rope system maybe?
In the end, you do have a very enjoyable demo here. Would love to see those mixed concepts you have here developed further and touched on lightly as you go.
Best of luck to you moving forward 👍