Fix poweruprate for bossrush impossible level

functions.cpp

@@ -1465,7 +1465,7 @@ void setup_level_bossrush(int level, double& shootr, double& poweruprate, int& w
 		{
 			shootr = 0.020;
 			refresh_t = (int)(0.07*1E3);
-			poweruprate = 0.01;
+			poweruprate = 0.04;
 		}
 	}
 	walls_num = 3;