It was fun
I gave it a 3 because at first it was nothing new or interesting. Then I liked the idea of upgrading your planet.
But the difficulty slope was too easy then suddenly lvl 10 got hard. And I don't think many people would have the patience to play to level 10. And then level 14 got too hard to complete, so what I'm saying is lvl 10 should be around lvl 4 or 5 because those first levels were too easy. Also you should include a way to purchase more stuff like a shop, and make it accessible after each level, because I noticed if I hadn't bought the laser at whatever level that was, there was no option for me to buy it later.
Thanks for your review.
You must get sufficient points to get the upgrade.
The game may be made more difficult but players may then get frustrated instead of getting bored.