fixed engine to limit input buffering in time

src/js/snek.js

@@ -82,7 +82,9 @@ class SnekGame {
 			worldWrap: true,
 			winCondition: 'none',
 			scoreSystem: 'fruit',
-			netPlay: false
+			netPlay: false,
+			autoSizeGrow: false,
+			autoSpeedIncrease: false
 		}, rules, settings.rules || {});
 	}
 
@@ -305,6 +307,17 @@ class SnekGame {
 				return true;
 			}
 		}
+
+		Object
+			.keys(inputs)
+			.forEach(k => {
+				let v=inputs[k];
+				if(v===true) v=5;
+				v--;
+				if(!v) delete inputs[k];
+				else inputs[k]=v;
+			});
+
 		if(inputs.left && trySet([-1, 0])) return delete inputs.left;
 		else if(inputs.right && trySet([ 1, 0])) return delete inputs.right;
 		else if(inputs.up && trySet([ 0,-1])) return delete inputs.up;