Well...erm...this is uh...it needs some work.
Fugues follow a strict, strict, format, which you did not follow.
Subject (A)[i]------------------------------------
Answer(B)[V]---------------------------- (CODA)
©[III?]----------------------------
that's a weird way of putting it, but the answer is the same as the subject, just in the dominant (or subdominant), instead of the tonic. You have a subject. Cool. Then your form completely skews. The "answer" is not notated the same way. Rhythmically, it's identical, and that's good, but you can only allow so many notational changes to the original subject. You change the notes subtly, but in great multitudes. Even if you let this slide, the 3rd voice entrance is rather irrelevant, and at that point the piece sounds like it's just 3 random parts playing at the same time. You don't want that
.
Good luck!
~Nico