Thanks for the feedback! In regards to the goal: the game does have a set length to it - after you survive 9 consecutive rounds, the final boss shows up, and if you beat the boss then you win the game. The music you hear corresponds to which level you're in (level 1 is rounds 1-3, level 2 is rounds 4-6, and level 3 is rounds 7-9 plus the boss). After each round, you can get a random powerup item by interacting with the poker chip character who appears at the centre of the room.