Call it a "Horror" themed 'Prince of Persia' meets a basic beat 'em up.
Gameplay: A bit stiff at first, but once acclimated, it's quite easy to control. As noted, it plays like 'Prince of Persia' with combat along the line of a beat 'em up - Say a little more basic than 'Streets of Rage' or 'Final Fight' series.
Graphics: Awesome cut scenes. Bland/drab colors in some levels, but very detailed. Boss fights are typically stand out graphically. Animation is very fluid.
Sound: Spooky and high quality. No real music for the most part; most of the time will have ambient tracks (that remind me of of the horror movie 'House'). Sounds are useful for determining what's a head.
Pro-Tip: Check the chests more that once. Sometimes that have 2 or 3 crystals.