fix tile colors, mem constant

cmd/game/main.go

@@ -47,10 +47,11 @@ func (*GameState) Do(f func()) {
 // func doSomething(State main.GameState, args...) {
 // 		...
 // 			State.Do(func() {
-//				...do stuff in main thread
+//				...do stuff in main thread, ie render something
 //			})
 // 		...
 // }
+// Use this trick CAREFULLY, cause closures may cause memleaks
 
 var State = GameState{
 	mainfunc: make(chan func()),