If the button labeled "EN" on the title screen changes the language, only Spanish and English will appear. It's a good idea to move the ship with the cursor. I'll update the version today, thanks.
That's only changing the language on the title screen. And it's annoying to have to hold the mouse button the whole time. If there are times in the game where it's best not to shoot, make it so you hold something down to stop firing. Otherwise, just make it so you shoot all the time no matter what.
The new, updated version is now available! It features new support for 10 working languages, and the click function no longer needs to be held down; it's activated/deactivated with a single click.