chore: cleanup

Game/Score/TotalScore.cs

@@ -6,24 +6,23 @@ namespace GodotHostTest.Game.Score;
 
 public class TotalScore : IScore, IDisposable
 {
-    private readonly IDisposable _connectedObservableDisposable;
-
     public TotalScore(ITargetEventBus targetEventBus)
     {
-        var connectedObservable = targetEventBus.Hit.Select(_ => 20)
-            .Merge(targetEventBus.TimedOut.Select(_ => -5))
-            .Scan(0, (x1, x2) => x1 + x2)
-            .Prepend(0)
-            .Replay(1);
-        _connectedObservableDisposable = connectedObservable.Connect();
-        Score = connectedObservable.AsObservable();
+        Score =
+            // map every hit target to +20 points
+            targetEventBus.Hit.Select(_ => 20)
+                // map every missed target to -5 points
+                .Merge(targetEventBus.TimedOut.Select(_ => -5))
+                // sum them all (starting with 0)
+                .Scan(0, (x1, x2) => x1 + x2)
+                .ToReadOnlyReactiveProperty();
     }
 
     public void Dispose()
     {
-        _connectedObservableDisposable.Dispose();
+        Score.Dispose();
         GC.SuppressFinalize(this);
     }
 
-    public Observable<int> Score { get; }
+    public ReadOnlyReactiveProperty<int> Score { get; }
 }