<s>
SteamWorld	B-Device
Tower	I-Device
Defense	I-Device
is	O
a	O
tower	B-Application
defense	I-Application
video	O
game	O
by	O
Swedish	O
video	O
game	O
developer	O
Image	O
&	O
Form	O
.	O
</s>
<s>
It	O
was	O
released	O
digitally	O
on	O
Nintendo	B-Device
DSi	I-Device
in	O
North	O
America	O
,	O
Europe	O
and	O
Australia	O
on	O
July	O
5	O
,	O
2010	O
.	O
</s>
<s>
It	O
is	O
the	O
first	O
game	O
released	O
in	O
the	O
SteamWorld	B-Application
series	O
.	O
</s>
<s>
In	O
SteamWorld	B-Device
Tower	I-Device
Defense	I-Device
the	O
player	O
controls	O
an	O
army	O
of	O
steam-powered	O
robots	O
in	O
a	O
tower	O
defense-style	O
gameplay	O
.	O
</s>
<s>
SteamWorld	B-Device
Tower	I-Device
Defense	I-Device
on	O
Nintendo	B-Device
DSi	I-Device
has	O
received	O
"	O
mixed	O
or	O
average	O
"	O
reviews	O
from	O
critics	O
,	O
with	O
a	O
current	O
score	O
of	O
71/100	O
on	O
Metacritic	O
.	O
</s>
<s>
Lucas	O
M	O
Thomas	O
of	O
IGN	O
gave	O
the	O
game	O
an	O
eight	O
out	O
of	O
ten	O
,	O
praising	O
how	O
polished	O
the	O
game	O
's	O
presentation	O
was	O
for	O
a	O
DSi	B-Device
title	O
.	O
</s>
<s>
On	O
their	O
YouTube	O
channel	O
,	O
Image	O
&	O
Form	O
revealed	O
that	O
SteamWorld	B-Device
Tower	I-Device
Defense	I-Device
is	O
the	O
hardest	O
game	O
the	O
studio	O
has	O
created	O
.	O
</s>
<s>
The	O
game	O
is	O
set	O
before	O
the	O
events	O
depicted	O
in	O
SteamWorld	B-Application
Dig	I-Application
and	O
SteamWorld	B-Application
Heist	I-Application
.	O
</s>
