Pinchpoint

An abstract highscore-chasing shoot-em-up.  Shoot the green meanie to score points. Don't let it hit you.  Every time you miss, the wall you hit moves closer.  What's the highest score you can reach?

Move with the arrow keys, shoot with the X key while moving.

Written for #TweetTweetJam 4. The code fits into two tweets:

w=128
c=circfill
a=abs
z=rnd
g=sgn
cls()x=8y=63::_::h,l,b,r=8,0,127,127s=0::b::o=o or{x=z(128),y=h}i=btn()v=(i&2)/2-(i&1)u=((i&8)/8-(i&4)/4)*(1-a(v))x=mid(l,r,x+v*2)y=mid(h,b,y+u*2)for i=0,999 do pset(z(w),z(w),0)end
n=t()d=o.x-x
e=o.y-y
o.x-=g(d)/2+2*cos(n)o.y-=g(e)/2+2*sin(n)c(o.x,o.y,2,z{3,11})if a(d)<=3 and a(e)<=3then
c(x,y,8,7)goto _
else
c(x,y,2,z{8,9})if btnp(❎)then
line(x,y,x+v*w,y+u*w,12)if v==g(d)and 2>=a(e)or u==g(e)and 2>=a(d)then
c(o.x,o.y,6,7)s+=1o=nil
else
r-=max(v)l-=min(v)b-=max(u)h-=min(u)end
end
end
?s,2,2,7
rect(l,h,r,b)flip()goto b