Those Walls, patched for wasmga.me: the score is reported with
trace("wasmgame:score:<n>") at game over, for the site's scoreboard.

Against the ld31 class as JPEXS FFDec 24.1.0 decompiles it from
bin-debug/ld31.swf at
https://github.com/SimianLogic/ld31-thosewalls/tree/7c342698dd20e04969af30b77a7b6f923839308d
Apply it to the decompiled scripts/ld31.as, then recompile that class:
  java -jar ffdec.jar -replace ld31.swf ld31-patched.swf ld31 scripts/ld31.as

--- a/scripts/ld31.as
+++ b/scripts/ld31.as
@@ -189,6 +189,7 @@
          this.bg.tryagain.visible = true;
          removeEventListener(Event.ENTER_FRAME,this.Update);
          stage.removeEventListener(KeyboardEvent.KEY_DOWN,this.HandleKey);
+         trace("wasmgame:score:" + this.score);
       }
       
       public function NewGame(e:Event) : void