To answer your direct question: Yes, you will be able to offer critical feedback. Part of the competition rules would be that all submissions to the competition enter the public domain, i.e. code must be released.
To answer questions you did not ask: 
These aren’t going to be huge games, probably a few hundred lines of code so I don’t imagine anyone having an issue with creating something for the good of the community and potentially getting a nominal reward for it. I really want the games to be a learning experience of how different programmers solve various problems.
Commentary from non-judges should be welcomed, though I would like to avoid, but cannot prevent, the “nice game!” one line comments. I am thinking, and feel free to weigh in here with suggestions, that each game will get its own forum thread once it is submitted, with a tag in the thread title of [COMPETITION] so that they can be easily found.
I will have created a standard set of artwork so that the technical people won’t have to worry about producing artwork for their games. The art assets will be geared at a very specific, very simple game that can be easily produced inside of 72 hours.
It will be up to the individual programmer to use the art assets in any way they see fit so long as all supplied art assets are implemented in the game as an active game element.
Exact details to be worked out but the competition rules will probably forbid adding extra artwork that cannot be generated through pure Unity 3D code – ergo shaders would be okay, procedural textures would be okay, but brand new 3D models created in Maya and textures in Photoshop would not. This will hopefully prevent the judges from being swayed by “ooh! Shiny!” graphics from someone who is artistically inclined but technically unable to deliver.
There will be restrictions on certain tools that can be used by the submissions, i.e. it should be possible to develop and run the game on the indie version of Unity3D, and it should not require any paid-for plugins such as SpriteManager. Nothing against SpriteManager, but I don’t want someone having an obvious unfair advantage because they could afford the license fee but their competition could not. All code should be able to be released to the public domain or freely and easily downloadable from a public website, so Stateless project would be acceptable, iTween would also be acceptable, but SpriteManager would not.
I want to gate the competition so that it is promoted about two or four weeks before release so programmers have plenty of time to find out about the competition, the rules are published well ahead of time, a submissions process can be created that is fair, the exact details of what is to be created and the art assets are released, the games are submitted, 72 hours pass for the judges to look them over, and then finally, the submissions are released to the public.