Got it.
Well for the 2D game, it feels like swimming against the current. The movement is hard with the mouse, and the delay between the shots is too high, I get hit nearly every time by the enemies.
One famous type of game that you could introduce is like Vampire Survivors or my game https://beorgames.itch.io/hero-battle-fantasy-arena. You could let the airplane move freely in the air in the direction the mouse is facing and still shoot when clicked, but the enemies would spawn in waves around the player. I'd give a higher movement speed to the airplane to make it more dynamic and different types of shots as upgrades. Pretty much like this game https://www.crazygames.com/game/void-scrappers but with a different thematic and being able to controls the attacks.
What do you think?