Submitted for Applecart. Thanks again, @dw817 for the fun challenge! Also thanks to @chizel9000 for the helpful feedback on the WIP.
Saucer Invasion is a game in which you shoot missiles at flying saucers. You can move the silo horizontally across the bottom of the screen and fire vertically at your foes. Your score for hitting a target is based on its height and speed, and there's a penalty for missing. The game ends when you run out of either time or ammunition. This is explained in a big ol' wall-o-text intro at the beginning, in keeping with the spirit of the original 1977 Apple II game that served as inspiration.
Updates from the WIP version:
Have fun! :-)