Grave Danger doesn't look great, but it has a great sense of style. Not every game needs to look like a Pixar movie, it just needs to have personality and a good design sense, and Grave Danger fits the bill. The entire game has a comic book sense of design that comes out during the comic book panels that tell the story. The voice acting is poor, but it kind of works with the game's sense of humor. Grave Danger manages to riff off everything from Star Trek to Homestar Runner and there's even a much appreciated Superman II reference. Not every joke is a home run, though you'll find something to laugh about.
For a game that doesn't push the visual envelope that much, the last thing you would expect is slowdown, however Grave Danger finds a way. Slowdown is only bad when the screen is filled with enemies; unfortunately that isn't a rare thing. There's also some noticeable screen tearing and even a few bouts of the jitters.