AlienBlast (#3275)

* Added my game

* A really fun alien game

* AlienBlast

* Update game metadata for Alien Blast

* Delete games/Block blast.js

* Update AlienBlast.js

I corrected what you asked me to do.

* Update AlienBlast.js

fixed something

* Update AlienBlast.js

I added a game menu, 3 skins variants and 3 maps.

* Added a thumbnail

I just added my new thumbnail

* Update AlienBlast.js

Fixed the last bugs (map, wrong color skins)

* Update AlienBlast.js

Changing afterInput to setInterval

Author: aloysboscariol