We're definitely interested to hear about the crashes! I think we've found all the places where significant lag has happened, but I don't think we've seen the crashes you mention. If you have any thoughts of where to look, please let us know!
I think the first crash was on the initial boot when playing in the browser - when the fire graphics are loading at the top of the tower, there was some significant stutter and then it just froze entirely. By the time it caught up to itself I'd hit the 'Death' screen. Entirely possible it was just the device I was playing on tbf