Bad Toys 3D - description from Softdepia.com:
Bad Toys 3D is a 3D first-person shoot-'em-up that has funny graphics and sounds. There are 25 levels of play. You explore rooms and open doors with your mouse or the keyboard, choosing weapons and collecting ammunition as you go. Shoot the funny little bad guys when you see them, but remember you have only three lives to spend. Games can be easily loaded and saved in progress. You won't find DOOM here, but Bad Toys 3D is entertaining. Sound-card support is provided. The shareware version includes 3 levels.
Bad Toys 3D is a "Free to try" program. You can download and try it for an evaluation period.