Hmm, when I load the savegame using 0.14.1, I can move around without problems.
In case Tux is stuck somehow, you can open the level editor using ctrl+alt+e and
move tux somewhere else ([Esc] -> Return to Game   to resume playing).

Anyway, you seem to be using the 0.14 release which is more one and a half years
old by now.
You should consider updating to 0.15.1 ;) (savegames are not compatible however).