Growing Up is explicitly intended as a jeepform implementation of Austen's Sense and Sensibility. In this, it has both strengths and weaknesses.
The jeepform is a particular style of Nordic larp involving short play times, small casts, recurring use of a suite of techniques discussed at the jeepen.org site, and often involving uncomfortable situations for the players, along with improvisational roleplay. In Growing Up, the players are expected to roleplay through 21 short (12 minute or so) "chapters" that recapitulate the story of Austen's novel.
The 'plot beats' that are supposed to occur in each chapter are set, by design, although the players are given considerable leeway to roleplay within the expected outcomes. Westerling suggests the use of several jeepform techniques, including inner monologs (a character giving a speech about how she is feeling) and GM-enforced cuts between scenes-in-progress. As is typical with the jeepform, however, there are no game systems of resolution; rules apply only to structuring of roleplay, not to resolution of outcomes. Unlike indie rpgs such as My Life With Master, systems are not used to shape scene outcomes, any more than moment-to-moment outcomes; in this case, indeed, scene outcomes are prescribed by the literary work on which the game is based.
The result is a game that seems to me almost too pressed into the shape of theater and too remote from the game; while I enjoy roleplaying, and would doubtless enjoy myself in playing a session of Growing Up -- and in particular, in exposing myself to Austen's sensibility, which is quite removed from the modern -- I would also chafe against the severe limitations of the form and the need to conform to an inexorable and authoritarian plot. In general, a degree of player agency is considered a definitive characteristic of 'the game', and while I'm willing to posit that player agency may, here, be adequately consumed by choices in moment-to-moment roleplay, at the sacrifice of any control over the narrative arc or character outcome, the close hewing to the novel constrains choices so tightly that I would find the work as a whole less than entirely satisfying.
But as another game exploring the intersection of theater and game -- perhaps falling too far on the side of theater -- it's an interesting work to read.