Well, guess what. I just installed the CHDK_DE build, and Snake works just fine.
Here's another bug, this time in default.lua (probably applies to other models as well):
FWIW, I wasn't able to reproduce the reversi/snake issue on elph130.
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Started by orda « 1 2 » General Help and Assistance on using CHDK stable releases
Started by Enchplant General Help and Assistance on using CHDK stable releases