This was a good arcade. Only need minor adjustments i feel like the quantity of foes and the force of the reboud at thout them its a tad too much,
I like the square it's the treat while the foes are a walking spring, making each shot strategical as you fail have another spring bouncing around.
Maybe you could add a gauge, make the player collect coins and when fill the gauge can push back all the enemies, generating a wave from the center.