The demo has now been updated to version 0.0.2, with the following changes:
We've introduced a couple graphic options that you can tune down to increase performance on lower-end devices.

Balloons will now deflate after hanging on to them for a while so you can't fly around forever.

Thank you everyone for all the bug reports and feedback you've given us so far! We're continuing to investigate issues relating to lobby creation and joining, as we've seen some reports here that we have not yet had a chance to address.