Add more menus and endless mode

scripts/load_high_score/load_high_score.gml

@@ -0,0 +1,16 @@
+function load_high_score() {
+	if (file_exists("highscore.dat")) {
+		var _file = file_text_open_read("highscore.dat");
+		var _str = file_text_read_string(_file);
+		file_text_close(_file);
+            
+		try {
+			var score_data = real(_str);
+			global.high_score = score_data
+		} catch (_) {
+			global.high_score = 0;
+		}
+	} else {
+		global.high_score = 0;
+	}
+}

scripts/load_high_score/load_high_score.yy

@@ -0,0 +1,13 @@
+{
+  "$GMScript":"v1",
+  "%Name":"load_high_score",
+  "isCompatibility":false,
+  "isDnD":false,
+  "name":"load_high_score",
+  "parent":{
+    "name":"Scripts",
+    "path":"folders/Scripts.yy",
+  },
+  "resourceType":"GMScript",
+  "resourceVersion":"2.0",
+}