I'm sure there are many factors. Usually our submission rate is about 20% but this years' was 13.5%. I'm sure the #2020 factor is part of it, teams, etc, but I have another pet theory that our relatively low submission rate is correlated with our push to bring new people into game dev. Open Jam tries to bring two groups together: gamedevs who haven't tried open source tools, and open source devs who haven't tried gamedev. The latter group probably contribute to the relatively low submission rate, since they are new to the gamedev and gamejam scenes.