We've seen games like this before, but the puzzles here are quite nice.
The graphics ARE minimal, and here's is why I think that's a problem. It's a puzzle game. The challenge is in solving the puzzle of where to put the arrows. Having a guy run around and kill monsters is just a pasted on theme. And if it doesn't look good, why choose to use it? You could have had lasers and mirrors, or water and pipe, or any number of other simpler designs on top of this mechanic. If you are going to have a guy slaughtering demons, it better look and sound and feel as cool as that idea suggests.
Also, he runs so slooooooooooowly.