I'm looking for a javascript / HTML / Canvas based program that emulates something similar to a "Legend of Grimrock" Dungeon Crawler where you walk through an environment in a grid-like format. I don't need game mechanics; Just the walking around part and maybe some basic interactivity thrown in. I've looked at raycasting engines (which are nice but a little too complex for what I need); X3D / VRML is way too complex for what I need. I don't need standalone because I want it to be on the internet for users to interact with.

Any help would be appreciated. Thanks.