Thanks for the kind words!
To answer your question, the game is originally intended for iPhone, but I still am working on it. I mostly test this game on the computer so I'm used to it, but I do understand the questioning on why to use a trackpad/mouse. I tried using arrow keys for testing before, but I could not find the right speed for the ship and the 8-way movement puts some limits. Plus, dragging the ship away at the last moment from a bullet seems like a better solution.
I also tried just dragging without click-and-holding, but before I couldn't find a scenario where the ship would not jump to a far-off location from the screen (if the mouse was to be off-screen or some other bug). But now, as of writing this, I just got an idea to solve this. Thanks for taking an interest in my little game.