Thank you for the useful feedback and suggestions! We definitely plan on adding features (YAY FEATURE CREEP) and tweaking the economy in the game to make it feel fair. It's definitely doable for us to tweak some values and make it a bit cheaper for the first level unlock and add some more inexpensive ships. Still thinking about adding levels and enemy types as well to make things even more varied in the levels. Also potentially a buyable unlock for a pickup that instantly restores your AoE attack.
-Shenk