Shortest Way of creating a basic Space Invaders Game in Python Your challenge is to create a basic version of Space Invaders in Python
Rules

Program must be not written in Py3K
All levels must be randomly generated
There must be a HUD showing the players score

The winner would be the answer which uses the least amount of code
Some Questions
Q: How detailed do the aliens and other elements have to be?
A: The aliens should be Block ASCII
Q: Can the bunkers be simplified to rectangles?
A: Yes, as long as they are filled
Q: How many enemies/bunkers do there have to be?
A: Number of Enemy's are chosen by random. 4 bunkers
Q: Do we need to implement the &quot;mystery ship&quot; that goes across the top of the screen?
A: No
Q:Do the symbols/characters that make up the laser cannon and the aliens need to be different?
A: Yes
Q: Do they need different shapes?
A: Yes
Q: Does it matter how fast the bullets/lasers travel?
A: No
3060 3031 characters

OKAY, this was fun. But I very highly doubt that my code is short enough to compete, or if it's basic enough. I'm new to code golf but regardless, I had fun and that's what matters. I'm too used to object-oriented programming so a lot of my code is probably just too much objects...
Game runs solely in the console, and I shortened most of the code with the exec''''''.replace() method. Complete with input of your name, random enemy firing, walls, aliens are randomly generated, worth 50 points each. each time you fire you lose one point so that you lose points if you just hold space in one spot to beat the level. Enemy speed increases each level, capped at every 0.2 seconds. Prints the level number, and game over at the bottom, your name,lives, and score at the top left. you have 3 lives. Ungolfed version is ~9500 characters, but I'll leave that out of here for now

instructions: fire with space, move with a and d, exit with x

let me know what think, if I can improve on anything

edit: forgot that msvcrt is Windows-Only. perhaps I can make a unix version too...

exec'''import threading as t
import msvcrt,Queue,time,random,os
u=raw_input('name:')
r=range
@Z:
$~(S):S.w=78;S.h=30;S.X();S.l='';S.Q=[];S.q=[];S.m=''
$J(S,x,y,c):S.q.append([x,y,c])
$X(S):S.s=[[' '^y in r(78)]^x in r(30)]
$V(S):
?s='';S.X()
?^x,y,z in S.q:S.s[y][x]=z
?S.q=[]
?^x in S.s:
? ^y in x:s+=y
? s+='\\n'
?s+=S.m.center(S.w)
?if s!=S.l:os.system('cls');S.l=s;print s
@E(Exception):pass
@C:
$~(S,g,c,p):S.g=g;S.c=c;S.p=p;S.s=[]
$M(S,a,d):
?if (a&lt;0 and S.p[d]==0) or (a&gt;0 and S.p[d]==(S.g.z.h if d else S.g.z.w)-1):raise E()
?S.p[d]+=a
$X(S):S.s.remove(S)
@A(C):
$~(S,g):C.~(S,g,'A',[39,28])
$M(S,a,d=0):
?try:C.M(S,a,d)
?except E:pass
@Y(A):
$~(S,g,p):C.~(S,g,'Y',p);S.s=g.a
@B(C):
$~(S,g,p,n):C.~(S,g,'|'if n&lt;0 else'*',[p[0],p[1]+n]);S.s=g.b;S.d=n;S.a=0 if n&lt;0 else 1
$M(S):
?try:C.M(S,S.d,1)
?except E:S.X()
$b(S):S.g.z.J(S.p[0],S.p[1],'X');S.g.z.V();S.X()
$co(S):
?^w in S.g.w:
? if S.p==w.p:S.b();w.X()
?if S.a:
? if S.p==S.g.p.p:S.b();S.g.d()
?else:
? ^a in S.g.a:
??if S.p==a.p:S.b();S.g.P(50);a.X()
@W(C):
$~(S,g,p):C.~(S,g,'#',p);S.s=g.w
@I(t.Thread):
$~(S,g):t.Thread.~(S);S.f=1;S.c={'a':g._g4,'d':g._g3,'x':g._X,' ':g._fi};S.start()
$run(S):
?while S.f:
? c=msvcrt.getch()
? if c in S.c:S.c[c]()
$X(S):S.f=0
@G:
$~(S):S.z=Z();S.x=3.0;S.c=0;S.b=[];S.Q=Queue.Queue();S.I=I(S);S.g2=0;S.g1=0;S.do=0;S.f=1;S.v=0;S.l=3;S.ti=[];S.G(1);S.O()
$O(S):
?while S.f:
? time.sleep(0.02)
? if not S.a:S.G(1)
? S.ch();S.B();S.u()
$u(S):
?S.z.X();S.P(0)
?s=u+' '+`S.l`
?^i in r(len(s)):S.z.J(i,0,s[i])
?^i in S.a+S.b+[S.p]+S.w:S.z.J(i.p[0],i.p[1],i.c)
?S.z.V()
$ch(S):
?try:
? while not S.Q.empty():S.Q.get_nowait()();S.Q.task_done()
?except Queue.Empty:pass
$cl(S):
?try:
? while not S.Q.empty():S.Q.get_nowait();S.Q.task_done()
?except Queue.Empty:pass
$_g4(S):
?if not S.g2:S.g2=1;S.Q.put(S.g4)
$g4(S):S.p.M(-1);S.g2=0
$_g3(S):
?if not S.g1:S.g1=1;S.Q.put(S.g3)
$g3(S):S.p.M(1);S.g1=0
$_X(S):S.I.X();S.Q.put(S.X)
$X(S):S.f=0;S.I.X();S.st()
$_fi(S):
?if not S.do:S.do=1;S.Q.put(S.fi)
$fi(S):S.b.append(B(S,S.p.p[:],-1));S.do=0;S.P(-1)
$_af(S):S.Q.put(S.af)
$af(S):c=random.choice(S.a);S.b.append(B(S,c.p[:],1));S.nt(random.uniform(0.1,2),S._af)
$nt(S,n,f):x=t.Timer(n,f);S.ti.append(x);x.start()
$st(S):
?^i in S.ti:i.cancel()
$G(S,n=0):
?S.st();S.cl();S.p=A(S);S.a=[];S.w=[];S.b=[]
?^x in[[i,o]^i in r(30)^o in r(3,10)]:
? if random.randint(0,99)%4==0:S.a.append(Y(S,x))
?S._m();S._af();f=[]
?^x in [6,27,46,65]:f+=[[z,y]^z in r(x,x+6)^y in r(23,26)]
?^i in f:S.w.append(W(S,i))
?S.v+=n;S.z.m='Level %s'%S.v;S.u()
?if S.x&gt;0.2:S.x=1.6 - S.v*0.1
?S.m1=0;S.m2=0;S.k=1;time.sleep(3)
$_m(S):S.Q.put(S.m)
$m(S):
?x=0
?if S.m2:S.m2=0;S.m1=0;S.k=-S.k;x=1
?^i in S.a:i.M(*(abs(S.k),1)if x else(S.k,0))
?if S.m1==47:S.m2=1
?else:S.m1+=1
?S.nt(S.x,S._m)
$B(S):
?^i in S.b:i.M();i.co()
$d(S):
?S.l-=1
?if S.l==0:S.z.m='Game Over!';S.X();return
?S.G(0)
$P(S,n):
?S.c+=n if S.c+n&gt;0 else 0;x=`S.c`
?^n in r(len(x)):S.z.J(n,1,x[n])
G()'''.replace('@','class ').replace('?','  ').replace('$',' def ').replace('^','for ').replace('~','__init__')


what the screen looks like:

Blazer 3
488            |

      YY  Y         YY  Y Y Y     Y
      YY  Y   YY  Y  Y           Y
      Y   Y    Y      Y    YY
                           Y   Y  Y
       YY Y   Y   Y Y             Y
           Y  YY YX Y Y
       Y       Y |                 Y




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         *

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                     A

                                   Level 1


edit: managed to remove something I accidentally left in I wasn't using anymore