Type to shoot. Takes at least 30 or so levels to get difficult. Multiplier for strings of letters without any mistakes. Shoot the motherships (long words) first. They spawn smaller ships that move faster. My one game high score (from the total of two I played): 6,786. Accuracy: 92.5%. Levels cleared: 38. I wish this was the typing game I played when I was 10 instead of clearing bugs from the windshield of Mavis Beacon.
Update: Z-Type is made with HTML5 using the Impact game engine. It’s so slick I didn’t even notice when I was playing it wasn’t Flash.