Overall the game is pretty fun, but there are some bits I think could use some work.
I had hard time aiming with most weapons as the cards were quite small and moving around a lot, not to mention I had to keep moving myself to not get hit by anything. I also died too quickly many times to really have a chance to practice and get used to new weapons. Maybe it would be a good idea to have some sort of difficulty progression not complete randomness.
It took me a while to understand how to use melee weapons. Would've helped to have one in the starting room with the machine gun. Furthermore I would've hoped they'd be more effective against the enemies running toward me or at least hold them back, but using them just seemed like a sure way to die.
By the way, do the slot machines take weapons instead of coins? Would explain why I lose my old weapons each time :)