Alien Attack v1.4 update

Unexpected update is here!

Added:

• New palettes selection system: now you can buy palettes which you want the most, using points. The palette shop is in the main menu, below the "START" button.

• New skin ( unlocked after getting "Palette Lover!" achievement ).

• Updated achievements' images: the game's visual style has changed since 2016, so there are new images.

• Smooth menus' navigations: it looks a lot cooler when they're smooth... right?

• Minor fixes

Have fun!

And don't forget to post bugs here if you find some.