Work on more references

src/game.rs

@@ -1,7 +1,7 @@
 use crate::level::Level;
 use crate::player::Player;
 
-pub struct Game {
-    pub player: Player,
-    pub levels: [Level; 25]
+pub struct Game<'game> {
+    pub player: &'game mut Player,
+    pub levels: Vec<&'game mut Level>,
 }