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Having the option to use an xbox controller is good.
This reminded me of a favorite game of mine when i got my first Tablet and it wasnt long before that game took off to the stars just like i did as i tried to drag the waves of enemy commets away from my home planet in Planet Keeper!
The kiting tactics coming into play had me ducking and weaving inbetween obstacle planets and that was very fun! I could suggest adding some more diversity in the enemys perhaps or some upgrades would be very helpful as you progress through the waves.