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I get a GLSL error right after clicking Start:

   34 | vec4 grid(vec2 p, vec2 b)
   35 | {
   36 |  p /= b;
SHADER ERROR:   37 |  vec2 pg=floor(p),pc=p-pg;
   38 |  return vec4(pg, vec2(pc.x, 1.-pc.y));
 Expected a ';' after 'shader_type sky'.
   39 | }
          at:    40 | 
(null) (:1)
   41 | vec2 ascii_to_pos(int code, vec2 glyph_bounds)
   42 | {
   43 |  vec2 b=floor(tex_res/glyph_bounds);
   44 |  return vec2(
ERROR:   45 |  float(code%int(b.x)),
   46 |  float(code/int(b.x))
 Shader compilation failed.

Running under Wine in Linux x86_64.