Are we allowed to make any adjustments to the game and then upload again before the judging is over?

One player thought the game was a bit hard so if I could make it a bit easier. I could do that with some tweaking. Another had a good idea about changing the time between casting fireballs. Lastly, I didn't have time to put in the final boss battle.

Are any of those things allowed? If not I'll wait till the judging is over and may adjust them then.