Added 4 barriers statically
Animations are there; there's a bug however

There's an out-of-bounds exception when a block which is just about to
be destroyed is hit
Working! kind of...

Stuff works! the animations are responding accordingly - the issue now
is visuals; things look kind of off; but ya :)
Interim results

The presentation is much cleaner after a redesign of the block class;
but the sprites don't change when hit
Getting there

The sprites update now; had to reload the texture
Fixed an issue & cleaned code

Fixed a bug where the pink "image file not found" texture would appear
temporarily when a block was destroyed
Correct block self-destroying
working build

The barriers are re-instantiated after a game over, and not after all
the aliens are killed =D