Just got linked this impressive 2.5D action. Basically it's The Specialists/Max Payne in sidescrolling fashion:
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[Blocked Image: http://www.deadtoast.com/img/MFP-BBB_Dual_aim_run.gif][Blocked Image: http://www.deadtoast.com/img/MFP-BBB_Walljump.gif][Blocked Image: http://www.deadtoast.com/img/MFP-BBB_Window_jump.gif]
More on the link included above. They also created custom tools to build the rooms in Unity, which seems a very good and fast workflow! Here a complete video overview.
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[Blocked Image: http://deadtoast.com/img/devlog/entry4/new_level_whitebox.jpg]