First I have to say, that I have not beaten the final boss yet. The game has a nice size to it. The animation and background work is really incredible. The Music has some nice catchy tunes but stays a little to much in the background.
Gameplay is absolutely solid and after a small learning curve it just plays fine. The controls are never an issue and failure is simply because of the player and not some unfair level design or unfair enemy placement. The last stage before the final boss is a little to lengthy for my taste but it really builds up the final fight.
The cart does actually glow in the dark which gives it a nice spooky vibe.