The tempo should be slightly slower in my opinion. The reason for this, is so that the ear can hear the melodies more clearly. It's a really nice fugue though, much better than the Chopin fugue I literally just roasted 😆. This one is much more harmonically interesting. Between the harpsichord vs and piano version, I prefer harpsichord because I feel it offers more clarity (which is unusual because normally I prefer piano). BTW, the harpsichord sounds a little out of tune. Was this the samples you were using, or did you mess around with the tuning?
Some notable parts of your piece
Intro: Very strong subjects
0:35: Nice chord progressions!
1:04: really interesting rhythms here
2:05: beautiful return to your subjects
2:40: that fun rhythm from 1:04, was brought back, which I like
Overall, this is a very beautiful fugue, that just needs a slight tempo decrease.