Holy Cow, you did this in a week? Amazing!
the simple loop of planting, gathering and upgrading is quite addictive, the pixel art is beautiful and you even have a mine with a decent scene transition. The aliens keep you on your feet and hold up the tension. Brilliant. I envy you for the quality of your your game.
The tiniest improvement was the click range when harvesting. That felt odd sometimes but we're talking QoL at the last 2% of perfection.