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Building doesn't subclass Struct, has #move_left method.
Building edges are less ASCII tainted.
Game Over banner has solid background, changed message.
Scoreboard has solid background.
Eliminated enormous ternary from building windows.
Overhaulted RoflCopter movement; now with more X axis!
Screen#on_exit write new-line to output.
Removed debug output of FrameBuffer size.
Further enhancements to RoflCopter sprites.
Alpha transparency support for RoflCopter
Player uses Background for "alpha" transparency
Abstracted Pixel and Background
Extracted executable into separate file.
Player#jump! (as opposed to #jump) works even when not walking.
Cleanly exit on interrupt (ctrl-c).
ScoreBoard spaced in slightly from corner of screen.
Building height (underground, not visible) reduced.
Buildings are garbage collected earlier.
Reduced screen width, and building-creation-horizon.
FrameBuffer size counter.
Tweaked player running sprite; hyphen -> comma.
Building color variance.
Taller minimum height for buildings.
Dead character sprite updated; legs point right-wards.
Player animation sprites.
Shorter initial building runup.
Game Over has left & right padding.
Speed and building parameters tweaked.
Initial building width increased from 100 to 160.
Frame rate is capped; prevent hyper warp speed.