The title of the game and premise of a Bloodsport makes for a great pun. But you did manage to make a game out of it though! I felt that the gameplay wasn't very balanced. I didn't get that urge to keep playing again and again which is what I want for an action/arcade style of game. It was pretty hilarious to see the character's body contort in weird ways while you strafe and run. I can sympathize though. Making a true top-down game with appropriate art is hard to achieve. As for the performance issues: I'm not sure how it works in your engine but typically games preload audio for short sound effects so the game won't pause the first time you try to play it.