I took the martingale strategy and slightly modified it, to make sure it starts at my base bet, and to allow me to bet with my choice of payout multiplier:

Code:
var baseBet = 1; // in Bits
var mult = 2.01;

var satoshis = baseBet * 100;
var crash = Math.floor(mult*100 + 1e-6);
var currentBet = false;

engine.onGameStarting = function () {
    if (currentBet && engine.lastGameWasLost()) {
        currentBet *= 2;
        console.log('double bet to', currentBet/100);
    } else {
        currentBet = satoshis;
        console.log('reset bet to', currentBet/100);
    }
    if (currentBet < engine.getBalance()) {
        console.log('place bet of', currentBet/100, 'at', crash/100);
        engine.placeBet(currentBet, crash, false);
    }
    else {
        engine.stop();
        console.log('You ran out of bits :(');
    }
};