Was looking at some of the other entries, and saw the btn-parsing code in WeeblBull's1k-dailhex. Using that, and adding back in the label text, it still Shinko-8s into 264 characters, a tweetcart!
x=56 y=42 i=0 f=rectfill ::r:: f(0,0,127,127,8) f(6,15,121,111,5) f(7,16,120,110,6) ?"\^wpic-o-sketch",17,4,10 ?"⬅️➡️⬆️⬇️:draw 🅾️:clear",18,120,10 ::_:: b=btn() x+=b\2%2-b%2 y+=b\8%2-b\4%2 i|=b&16 i-=1 flip() if (i>=0) camera(i/2-rnd(i),i/2-rnd(i)) goto r i=0 pset(7+x%114,16+y%95,1) goto _
Switched to the "o" button instead of the "x" button for the clear input, since its place in the btn() bitfield is 16, just one off from the number of frames for the shake, so I didn't need a separate constant for that.
Other big difference between this and yours, is that I'm use modular arithmetic instead of mid to constrain things to the field. Saves a few characters.