This is more so directed towards the host of the jam - with regards to the limitation of either a smartphone or micropc, can separate mics be fed into them and recorded that way, such as a lav microphone that you could plug into a phone's headphone jack?
And regarding the 5-minute theme - should the five minute time limit be reached, does the game have to fully close out, or can it either restart from the beginning or send the player back to the main menu?