It's really well made and worth time to play. Seems like the only tower Defense here.
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Game is fun and well balanced but it woudl be cool if you added more mechanics. For instance, you can add more little ships, instead of the one big alien cruiser. Each of them has different attacks and way to handle. Also allow to build more than one building to a planet and make a cooldown for it. And add resources like metal, oil etc. Or add more buildings and weapons like dyson spheres or black hole bombs. This Spheres can charge guns from solar power to oneshot the whole armada of aliens. Would be cool if you add extra mechanic of invading the planets to get resources and solar power.
If it's not hard can you rate my game too, also made in ue4, but in 3D.