Gave it a go....
A downloadable game for Windows
Oneiro is a 1st person 3D action-adventure game in which the player travels through a surreal and sometimes disquieting dream world. The player's goal is to escape back into reality, exploring, solving puzzles, and sometimes fighting their way through the dream in the process. Each level corresponds to a different section of the dreamscape which varies greatly in terms of content.
You can view additional resources, including an instruction manual, route map, and link to a video walkthrough by visiting http://www.oneiroproject.com/
Extract the files from the ZIP archive, then double-click the executable. If you encounter a "GetThreadContext failed" error while running the game, copy the mono.dll file in the main directory over to the Oneiro_data/Mono folder. See the instruction manual for further details.
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Thanks for the vid, I appreciate it! You were on the right track but to get past David you will have to hit him in the head until he dies. That means finding a taller place to jump and attack from because his head is up so high.
There's also a video walkthrough on the main Oneiro website if you get really stuck.