Hi! I agree that the rules should have been a bit more defnied. I did indeed use a hand full of sprites/sounds from an older project and a map generator system I made previously. All that work would have not cost me more than 1-2 days and 90% of the features of my game were made for the jam. I was surprised actually that you where allowed to start a couple of days earlier wich I made use of since I had a very many features in mind. Though I understand your point that this might feel unfair to some participants who only worked during the jam.
Viewing post in Games Should Be Made DURING THE JAM PERIOD
I'm pretty sure that most here would consider that to be a reasonable amount of asset reuse/repurposing. Like I originally intended to use a menu system that I had made a while back for the title and pause menus in my entry (I ended up not using it because it was going to take too long to adapt it to the way I decided to draw GUI elements to better handle variable screen resolutions, but I digress). It's the small handful of games that made it into the jam that were originally completed months (even years) ago that only had a few adjustments made to better suit the theme of the jam during the jam period that seem to be getting people a little salty about the loose rules.