Maybe I am just spoied by the fact that all online games (and ost games in general) always allow continues, but seriously...not many people playing an online flash game are going to take hte time to go back and play all the levels over again if they die on the last level. It was fun to play...but not THAT fun.
Also a potential bug, unless it was planned. But you can exit out of boards and you keeo your money earned. So you can power up very quickly if you wanted to exit out of early levels right before you end.