Got a crude demo of falling blocks stacking working

It sometimes takes a long time to detect game over, once I noticed it reported game over before it appeared to be the case...
Other than that, the collision-detection so far appears to be working brilliantly

source/main.cpp

@@ -317,6 +317,8 @@ bool game_over;
 
 void start_new_game() {
     game_over = false; // we're starting a new game
+    // clear the stacked shapes image
+    stacked_shapes.clear();
     // TODO: add event-handlers for button-presses
     unsigned long stopwatch = UBIT.systemTime();
     unsigned long move_speed = 350; // move down one block every 350ms
@@ -354,10 +356,10 @@ void start_new_game() {
             stacked_shapes.paste(block.image(), origin.x, origin.y, 1);
         }
     } while (not game_over);
+    // TODO: clean up game state 
     // TODO: remove event-handlers
-    // TODO: add GAME OVER message
+    UBIT.display.scroll("GAME OVER!");
     // TODO: add display of score
-    return;
 }