I put this Jam up only yesterday, and didnt tell anyone about it yet, so actually that you already joined in under 24 hours is a good sign. Previous FeedBak & Exchange Jam, which ones playtesting & feedback period is ending today, had 44 games, and everyone seems to have got at least one feedback, and ones having only one feedback seem to be ones having some sort of major technical issues. Interesting to see if your email logging will prevent people from playtesting it.
While playtest period basically starts on April, at least last time lots of games got playtests already before, which is fine, since point with this is just to get feedback for your games, whether it is during the official period or before. As long as its feedback, its good. I will try to keep your game in mind and try it out in one of these days and give it a proper test.