so its basically like an automated deathrun? i'm somewhat confused by what you put in the OP.
Ok, i'll try to explain Further.
You spawn on one of the islands. There is a timer. The timer will start at 10, as your "Preparation" time. When it reaches 0, then THAT'S when you have to swim to the other side, because at that same time, Killer Blockheads are going to be released on the starting point and try to kill you, forcing you to swim to the other island. The water inbetween the island has sharks in it.
The timer restarts when it reaches 0, but this time, it will start at 60, which is now the time you have to get across the water, to the other island. When you reach the other island, You have the possibility of climbing up to goto the suspended bridge in order to gain a headstart.
Finally, when the 60-second timer is up, it restarts at 10 seconds, your "Preparation" time, and the cycle repeats.
You also get a weapon, possibly a sword, to fend yourself from the sharks.
Damn sharks.
the only problem is the flat-edge cliffs but that's not really remediable.
I'll attempt to work on that.