Release v0.5.1 (Surround Sound) introduces some major new features, completing enough of the "Immediate" goals and adding enough of the next level features that it's finally time to call it a beta release. There's no audio update -- the code name is just a play on the version number.

Bugfixes:

• Some tower doors still  hinging in bizarre ways
• Intro speech can't be skipped (which is tedious if you're familiar with it)
• Lakes in large landscapes don't reflect across whole surface

New features:

• Export/import of initial game state to allow sharing
• Different game types (finish by emptying postbag, or endless mode)
• Scenic details
• ... plus a little surprise