Just my 2 pennies but...

Why don't you make a simple site, a time period for people to enter a link to their project with a description.

Then a time period for people to go through the list and download the games.

Then just look at statistics of which games received the most downloads?

Just provide a well crafted capcha to stop people spamming.

 feel free to replace 'you' with 'we'

Ps. I am new here.