Update 0.7.6

This update contains the following:

FEATURES

• (Endless Mode) Added a new difficulty called NIGHTMARE!

GAMEPLAY

• (Standard Mode) Levels are now slightly less difficult
• (Endless Mode) Enemy ships always have 1 health on Easy
• (Endless Mode) Slightly decreased alien movement multiplier on Hard

VISUALS

• (Endless Mode) Normal, Hard and NIGHTMARE! now have different backgrounds
• (Endless Mode) Changed Hard button color in Main Menu
• (Endless Mode) Changed info for Normal and Hard difficulties in Main Menu

BUG FIXES

• Fixed a bug where the bottom-left message would not disappear if the player was destroyed