Really liked the game idea. It was quite enjoyable. The controls were easy to understand, and very intuitive. I liked how the keys clustered around the same area (so the game could even be played with one hand :D). I could see myself sinking more time into this with better difficulty optimization. When I understood how the game works it became way too easy, as I had a ton of resources, and could collect a lot in each level, and a big army that would demolish everything in a new area.
Also, once an area is clear of enemies, the game has this boring phase where you just run around doing nothing and waiting for resources while the falling ground catches up. I think there should be something more interesting to do during that time.
Another slightly unintuitive thing were the forrests. At first It thought you can’t pass them (they seemed super dense) so I used to try to run around them, and I even once I saw you can pass them, I still would sometimes forget, and try to dodge them.
I think the collection of the materials was really great, I liked the animation of the numbers. I think it could be even more satisfying with some sounds.
I got a bit bored after 20 minutes and fell off the ground intentionally in the end.
Gave the game to my so. She also enjoyed it a lot, but after half an hour of play encountered a bug? Basically there were no exits and the ground was not falling anymore :D
Overall though, really polished, very enjoyable and fun. Good job!