Game locked up on me - I moused over the "tutorial quests" thing, it expanded and told me to click somewhere to dismiss the tutorial. Not sure if I did or not, but the expanded window went back to displaying "Hover over this tutorial for more info". Now music continues to play, but the UI is entirely unresponsive. Can't interact with the tutorial or anything else.
Edit: Javascript console shows things like:
06aefda2:0x64781 Uncaught RuntimeError: memory access out of bounds
at 06aefda2:0x64781
at 06aefda2:0x7fd389
at 06aefda2:0x80e657
at 06aefda2:0x80e1be
at 06aefda2:0x81506c
at 06aefda2:0x81ab97
at 06aefda2:0x81a93f
at 06aefda2:0x8319da
at 06aefda2:0x831983
at 06aefda2:0x8318de