WOW Absolutely Astonishing Pixel art I mean like REALLY
But Sadly the Game is too hard couldn't get past level 1 there's a few things you could have done to make it easier:
The thugs should stay down after you kill them.
The Player should have more health or the enemies could do less damage or maybe the player could heal over time.
Amazing Art but I think you should have spent a little more time on fully working on the mechanics.
TLDR: Solid entry With Cool art.