Thank you guys! I have updated with a new version. Now you can play with AIM mode (easier, by default) or with AUTOMATIC mode (more difficult). There are two highscores tables for each.
If I get more tips, I will improve the game.
I made this game for Ludum Dare 48h competition. Afterwards I added some powerups and scores system. Some people told me they would prefer the player was allowed to aim... tell me what you think, please! And Enjoy it!
 "Jellyfish Invaders"){kind=icon}