This is a pretty fun entry. The music's fun and the controls felt solid and easy to pick up (though I would put the control scheme in the actual game).
The contrast in the menu is a bit too low, I find it a little hard to see which item is selected. Also, why put the instructions window on a timer? Kept having to click it to fully read it.
I found myself not really using the sonar attack that much. I flew fast enough to avoid enemies anyway and was more concerned about the timer of packages, and it didn't feel super intuitive to use since I kept expecting it to shoot ahead of me instead of sideways. Maybe more challenges can motivate the use of sonar attacks more? I also found after a bit of playing that it gets repetitive fairly quickly; something more needs to change to keep the challenge fresh, e.g. characters move around instead of sitting still, obstacles might have to be shot in order to reach a package target, other little changes in the map that keep it varied, etc.