change fallback behaviour

src/Aquarium.cpp

@@ -106,9 +106,9 @@ void Aquarium::getTerminalSize() {
     height = ws.ws_row;
     width = ws.ws_col;
   } else {
-    // Fallback
+    cleanup_terminal(0);
-    height = 24;
+    std::cerr << "Error: Unable to determine terminal size.\n";
-    width = 80;
+    std::exit(1);
   }
 }