I had trouble learning how to play the game properly, but I eventually figured some things out. I was able to upgrade my axe and pickaxe to level 2, but I’m guessing that each color of the gem corresponds to stones in different locations (e.g., green gems from green rocks and red gems from red rocks, etc.). The same is probably for logs, but I didn’t manage to farm enough items for the third upgrade - maybe I just misunderstood something or I was only a few items off. If my guesses about the game are correct, it would be great if the different items obtained by harvesting had corresponding colors. An inventory that showed the amount of each item you currently have would be helpful. Overall, I think the game looks really good!