The game file crashes, not the .app, but if I edit the game file to say version 7.10 instead of 5.xx, it will play, but it is shrunken in odd ways - the walls lose their shape, the players are halfway through the floor, and the screen is still 8x8. The 16-count blocks DO work though, just buried in odd ways. I'm imagining that the changes in the .app itself are probably just to adjust the size of the playing field to fit, and update the source to be up-to-date with the main Bitsy source code. This is coming from a non-programmer, though :D I know there's more to it to build the .app structure.
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Interesting! I'm sure it's doable to support the higher resolution Bitsy games. My initial roadmap only includes supporting official Bitsy features, though I would love to extend support to some of the more popular Bitsy hacks at some point as well. I'll have to make a note to include the 16x16 version as well. :D