<s>
Alpha	B-Application
Blaster	I-Application
is	O
a	O
fixed	O
shooter	O
video	O
game	O
developed	O
by	O
Dave	O
Aron	O
at	O
Sumlock	O
for	O
the	O
VIC-20	B-Device
and	O
published	O
by	O
LiveWire	O
Software	O
in	O
1983	O
.	O
</s>
<s>
Aackosoft	O
published	O
an	O
MSX	B-Operating_System
adaptation	O
of	O
the	O
game	O
in	O
the	O
following	O
year	O
.	O
</s>
<s>
In	O
Alpha	B-Application
Blaster	I-Application
,	O
a	O
derivative	O
of	O
Galaxian	B-Application
(	O
1979	O
)	O
,	O
the	O
player	O
defends	O
against	O
an	O
alien	O
invasion	O
fleet	O
from	O
the	O
planet	O
Alpha	O
.	O
</s>
<s>
Piloting	O
a	O
lone	O
Federation	O
battle	O
cruiser	O
,	O
the	O
player	O
scores	O
points	O
by	O
shooting	O
flying	B-Language
saucers	I-Language
and	O
other	O
spacecraft	O
with	O
a	O
laser	O
cannon	O
.	O
</s>
