1. Make the player mash the button to shoot at enemies continuously instead of making them hold the button down to shoot continuously? I feel if I make each button press one shot each, then I could have an opportunity to make the player hold onto the shoot button to blast a charged shot, which can deal more damage than regular shots. Also atleast mashing buttons to attack is more intuitive than holding a button to win against enemies.
2. Should I add NPC's throughout levels to give you sidequests? Somethings like: A water pixie has been isolated from her lake and has been trapped inside of a water jug, so you must carry her to the lake nearby while avoiding enemies from knocking you over. Rewards are EXP, Monets (currency in this game), or even weapons.