Thanks for playing!
Currently, the energy should be draining per shot - not sure what's happening there, I'll have to look into it.
Yep, UI is definitely something I should investigate further, I'm trying to think of ways to explore it diegetically with colours or things on the ship.
Did you play the endless mode at all? That has different ships, some of which have bullets that track around the planet - like missiles. Let me know if that is what you were thinking of :).
Thanks again!