Cool! This was really fun to play. The gameplay, which I didn't understand at first, was really simply explained and easy to understand. I like the concept of having an increasingly difficult goal to achieve each cycle and having to strategize in order to complete it. Great job!
The art was simple, but effective. It wasn't anything too unique or insane, but I think the style you chose worked well for this type of game. Same goes for the music and sound effects - they add to the player experience a lot and work really well. The music fit's the games atmopshere perfectly, and it's amazing to hear you made it yourself!
The upgrades system also added an extra component of strategy and I think are a nice addition to the core gameplay.
I think that even more sound effects and an extra layer of polish would be a great next step for this game. It would be cool to see animations for when I collect resources, or more complicated graphics.
Despite this, this is a really fun and unique game. I quite enjoyed playing :)
