specify whether flixel projects need to pass html5/c++ compilation

projects/nat-flixel-desktop-playground/source/PlayState.hx

@@ -0,0 +1,22 @@
+package;
+
+import kiss.Prelude;
+import kiss.List;
+import sys.FileSystem;
+import nat.Entry;
+import nat.BoolExpInterp;
+import nat.Archive;
+import nat.ArchiveUI;
+import nat.ArchiveController;
+import flixel.addons.ui.FlxInputText;
+import flixel.addons.ui.FlxUIPopup;
+import flixel.text.FlxText;
+import flixel.util.FlxColor;
+import flixel.FlxCamera;
+import flixel.math.FlxVector;
+import flixel.addons.plugin.FlxMouseControl;
+
+using StringTools;
+
+@:build(kiss.Kiss.build())
+class PlayState extends FlxState implements ArchiveUI {}