The concept is fun and uses the limitation quite well (although you could argue that there's *technically* two resources).
Graphics and style fit the game nicely, the planets lighting up when firing the laser beam is a nice touch.
Bullets seem to go through the big enemies for some reason, even if they deal damage, and I would really like to see auto-firing, both for QoL and accessibility reasons.
It's also one of the few jam games with proper tutorialization, and the little intro sequence sets the scene nicely.