Hi junimadii! Yes, games should be 20 seconds or less but don't panic. To be more in the spirit of the jam, we suggest that you add a simple timer to limit the gameplay to 20 seconds. If you don't want to do that because it affects the game too much, the timer could show when the player has exceeded 20 seconds without ending the game. In any case, your game won't be disqualified from the jam because it's clear that it was made for the jam and you made it intentionally to fit into a 20 second play session. Thanks for jamming with us!