Thank you very much.
Well I didn't do it because of the jam in the first place but to make a tower defense game and to get a feeling for what is possible with AppGameKit in basic. However, it's a good suggestion so I may look out for another jam.
Now I still have to complete a game, it is not yet what it was supposed to be. I didn't even intend to make an endless mode but the deadline forced me to make something playable.