I started adding a couple of parachute variations. Purple ones are faster, while yellow ones are slower. These are just generic types. There will be more that will have armor, and other properties. I might even make types that can attack the player.
Another addition is the small UI for the bullet count of the player. This should make it easier for the player to time their attack, since they will know in advance how much they have left. The bullets recharge in a short while. As long as you don't fire too fast, you won't find yourself running out of bullets.