Indie game storeFree gamesFun gamesHorror games
Game developmentAssetsComics

There is a little difference, in the score system,  between Arcade and your great port of Galaga.  

If you kill this enemy 

during the challenging stage, you should get 400 PTS, but you receive only 100

Ah ok, that wasn't mentioned on the FAQ I was using for the scoring. Easy enough to add to the next update.