Write SQL query to solve given problem: Calculate the percentage of games published by 'Brash Entertainment'?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT CAST(COUNT(CASE WHEN T1.publisher_name = 'Brash Entertainment' THEN T2.game_id ELSE NULL END) AS REAL) * 100 / COUNT(T2.game_id) FROM publisher AS T1 INNER JOIN game_publisher AS T2 ON T1.id = T2.publisher_id