Space Invadors

P2W games is stealing the initial joy and happiness of games from us, can we found them back? This game is based on a retro game Space Invaders, but as the game goes further, there are more and more P2W elements showing up and ruining the experience. Could you get rid of them at last and find the initial joy of games?
Jam year: 
MS Windows, Mac OS X, Web standard (HTML5, Java, JavaScript, Flash)
Tools and Technologies: 
.Net, Unity (any product)
Game Tags: