There are several general features of your improvising which are conducive to free flow and the maintaining of interest. Firstly, you do not allow the physical aspect to dominate your idea generation; your technique appears to be controlled and subordinate to the musical impulse. While I see no reason why the haptic element ought not to be a legitimate driver of ideas, if given too much command it is inclined to outstrip music, especially in those possessing strong technique. Secondly, your phrasing and rhythm is always very clearly articulated, with each cell lucidly defined, regardless of whether it forms by similarity or contrast.
All sections I found enjoyable, particularly the stride and the fugato, which latter I felt could have been expanded a great deal more and gone on longer to good effect. Few people seem able to keep imitation baroque (for want of a better term) going as you can, so why not exploit the idiom more, perhaps with modern rhythms ? Overall, another thoroughly enjoyable improvisation.
Are you sure the best place for your recorder is sitting on the piano ? I spent a whole day testing my Zoom H2 and found the best results with it screwed on a tripod just inside the curve of the piano.
Topic: First fathers day Improvisation (video)