Second: it's a non-complicated harmonic development. It's not bad, but I think some sounds are confuse.
Third: this one is clear to me, having those sounds too, they are balanced, and the final result is much better.
Fugue A minor: it's beautiful, it sounds correct (I don't care about parallels and that, it it sounds good to you, OK). What I miss here is a sort of "climax".
Fuga in D minor: uff, I think the las bars are impossible to play (left hand).
Fugue in C minor: it's also interesting.
You know what? I love fugues, and sometimes I write one as an exercise. Buet I also try to go out from the "comfort zone". I mean, baroque fugues? we have little to add..., to what Bach and others did. Why not writing fugues in modal music, or using other scales...