As Strange Girl mentioned, the game was disqualified initially but we allowed it back in after some discussion. The game was made for the jam and while there is no 20 second limitation in the gameplay, the developers did attempt to make the game playable in 20 seconds and display a timer at the end.
Our intention is really only to disqualify games that make no attempt to engage with the jam's constraint, not to make judgements on how well a game satisfies the constraint (that part is up to you, the players, commenters and reviewers). The reasoning is that the jam should be friendly and low-stress for all the participants and we don't want people worrying that their game might get removed for some minor reason.
The games we removed from the jam were, for the most part, obvious spam. In cases where there is some doubt, we messaged the author to notify them that the game does seem to have any relation to the jam and gave them the opportunity to make changes. In some cases they did. In many cases, we did not get a response.
Sorry for the long post :D