Well, the simple thing would be to keep track of the time you're displaying in a variable, like this:
time% = 60-((Alarm-MilliSecs())/1000)
Text 347,565, time
If time > 200 Then Goto death
time% = 60-((Alarm-MilliSecs())/1000)
Text 347,565, time
If time > 200 Then Goto death