I love how you designed the controls. Despite how simple it is, it feels like actual dogfighting in 2D. I played the Web version but I bet it feels even better on Android

However, the enemies don't make any sounds when attack. And the sound effects for when the player gets hit sound the same as the enemies getting hit by player's bullets. So, I only know I'm getting shot when I'm losing health.

And while the enemies' bullets do have sprites, they tend to blend in with the background depending on the stage.

So,
- How about you add sound effects, like gunshots, whenever the enemies are firing?
- And how about you make the sounds effects for player getting damaged distinct from the enemies getting damaged?
These additions would make the game a lot fairer.

What do you think?