*SPOILERS AHEAD. DON'T READ IF THEY BOTHER YOU*
Read the story now
In a time when Muslims are either vehemently opposed to propounding good literature, or cannot get their heads out of cheesy (haraam-ish) romance novels, this book is what we need to set a new trend.
Now that I have completed my sweeping generalisation which I myself acknowledge is incorrect, allow me to "critique" your work. It's fantastic Ma sha Allah! I completed this a while back on Wattpad. Apart from the long chapters (didn't really bother me but I guess the mainstream crowd doesn't dig them), I was hooked. I still remember Ishaq's Mortal Kombat reference :P The fight scenes were well executed and apart from that, all the characters interacted with ways expected of them. Though I'm not sure whether I'm the biggest fan of Juan being the stereotypical backstabber.
You should definitely update the sequel. I know you're busy and all but when you spare a breather, do consider it.