JS1k: The JavaScript code golfing competition

h=innerHeight,w=innerWidth,i=T=0,v=8,S=0,X=200,Y=h/2,W=[],M=Math,u=50,x=10,y=20,z=97,F="fill",I=F+"Rect",J=F+"Style",G="beginPath",H="closePath",K="lineTo",L="moveTo",R=Math.random,Q=M.sin
function N(){A=w,B=R()*h}N()
for(;i++<X;W.push(R()*z+y));setInterval(function(){W.push(W.shift());T++;A-=v;
(X<A+x&&X>A-x&&Y<B+y&&Y>B-y)&&(++S,N())
A<0 && N()},z)
function C(n,a,b){return M.max(M.min(a,n),b)}function E(i,j,r){c[G]()
c.arc(X-i,Y-j,r,0,6)
c[H]()
c[F]()}(function D(){k=Q(T)
X=C(X,w,0)
Y=C(Y,h,0)
c[J]="#000"
c[I](0,0,w,h)
c[J]="#333"
for(i=0;i++<z;j=W[i],c[I](i*y,h-j,y,j));c[J]="#A00"
for(i=0;i++<y;E(i*x,Q(T+i)*x,15-i/2));c[G]()
c[L](X,Y-x*k)
c[K](X-x,Y-u)
c[K](X+u,Y+y)
c[K](X,Y-x*k)
c[H]()
c[L](X-x,Y)
c[K](X-z,Y+u*k)
c[K](X-u,Y)
c[K](X,Y)
c[H]()
c[F]()
c[J]="#AA0"
E(-x,k+x,2)
c[G]()
c.arc(A,B,x,0,6)
c[F]()
c.fillText("score: "+S,x,y)
requestAnimationFrame(D)})()
c.font="20px X"
b.onkeydown=function(e){j=e.keyCode
j==65&&(X-=v)
j==68&&(X+=v)
j==83&&(Y+=v)
j==87&&(Y-=v)}

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/*
 The code was hand minified and the keys to all the variables are:
 i = some number
 j = some other number
 k = another number
 h = innerHeight
 r = random
 u = 50
 w = innerWidth
 v = step size
 x = 10
 y = 20
 z = 97
 A = starX
 B = starY
 C = bound
 D = draw
 E = dragonFunction
 F = fill
 G = beginPath
 H = closePath
 I = fillRect
 J = fillStyle
 K = lineTo
 L = moveTo
 M = Math
 N = MoveStar
 Q = Math.sin
 R = random
 S = score
 T = theta
 W = walls
 X = dragonX
 Y = dragonY
*/