Its a cool little bullet hell.
The music is really nice and fit the game well, so as the sounds design so good job on that.
The spaceship movement are decent, i would have liked a keybord button to shoot but its ok with clicking too.
But i didn't got the gambling theme at all, did i missed something ?
Also the game is really hard on easy mode so i don't imagine how it goes on harder difficulties :)
One easy thing to change to go a long way : Describe what the upgrade do, some are intuitive (i guess rocket movement speed and rotation speed, others are bit more confusing, fire rate ? fire damage ? )
Also enemies can shoot at you from outside the screen which is a bit unfair and if an enemy is really close to you you cannot shoot it (the projectile spawn behind the enemy)
But overall, it was fun :)