I quite enjoy this type of game and it was competently made but this was too short and too passive. There's no challenge as you collect resources until you want to go spend them for upgrades, isn't even a need to actually fly around. There're no decisions in the upgrades, you just buy the next one. After you've bought all the upgrades you go and shoot a bigger square and the game ends.
it's cheap if you want a mindless incremental game that looks pleasant but i found it lacking substance.