I like the style, fun game.
as feedback, :
- you should add something to make a quick reload on the game
- Make sure your ui is responsive on 5 game it's happen that i can look at the upgrade cost
- make it more easy may be the gauge decrease really fast ^^'
- add more feedback, sometime it's hard to read what happen
But it"s a cool game good job team ! Nice idea to use ships as element and i really enjoy the game loop