The controls are pretty fun, to give it more content you could make the map cylindrical where your moving around a planet at the equator, that sort of gives you an automatic story and more content options like protect satellites and astronauts, guide ship to dock safely, drag items to base, to build some super weapon power ups, etc.
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I like the idea of sort of killing 2 birds with 1 stone by adding a simple visual trick that also adds story/theming to the project. In defender, the arcade game that inspired this game, you need to defend little dudes from aliens. I think your suggestions would mesh well with what I have so far. Thanks for the feedback!