I would recommend adding a bit more to the description on how to play, I nearly discounted the game as not having any working currency mechanic.
For other who are confused: Click to shoot the laser, Point it with your mouse.
Shoot straight down to mine and gain currency. Shoot the meteors to defend your base, when your shield reaches 0 or lower you lose.
Also I would really appreciate a button to open the shop menu so I wouldn't have to drag my mouse up there and interrupt the defense or mining.