good start

Qwirkle/QwirkleViews/Views/TileCircle.xaml

@@ -20,10 +20,9 @@
                    BackgroundColor="Transparent"/>
         <Ellipse HeightRequest="50"
                  WidthRequest="50"
-                 BackgroundColor="{Binding ColorPush, Source={x:Reference root}, Converter={StaticResource int2ColorConverter}}"
+                 BackgroundColor="{Binding Color, Source={x:Reference root}, Converter={StaticResource int2ColorConverter}}"
                  VerticalOptions="Center"
                  HorizontalOptions="Center"/>
-        <Label Text="{Binding ColorPush, Source={x:Reference root}}"></Label>
 
     </Grid>
 </ContentView>

Qwirkle/QwirkleViews/Views/TileCircle.xaml.cs

@@ -38,7 +38,7 @@ public partial class TileCircle : ContentView
     }
 
     public static readonly BindableProperty ColorProperty =
-       BindableProperty.Create("Color", typeof(string), typeof(TileCircle), "");
+            BindableProperty.Create(nameof(Color), typeof(string), typeof(TileCircle), "", propertyChanged: OnColorChanged);
 
     public string Color
     {
@@ -46,6 +46,13 @@ public partial class TileCircle : ContentView
         set => SetValue(ColorProperty, value);
     }
 
+    private static void OnColorChanged(BindableObject bindable, object oldValue, object newValue)
+    {
+        var bin = (TileCircle)bindable;
+        bin.OnPropertyChanged(nameof(Color));
+    }
+
+
     public static readonly BindableProperty ShapeProperty =
    BindableProperty.Create("Shape", typeof(string), typeof(TileCircle), "");