Ok, so I'll give you my honest opinion and I hope you take it with a grain of salt.
Obviously I like the part I am in. Didn't exactly say things the way I would have, but I could see you trying to have him be me which was nice of you.
The mom thing you have done and well, while I understand it, it was meh. Story could do without her. Reasons I say this is that I am trying to concentrate on your pursuit for Myste, your feelings between light/dark, and to throw in more feelings is just a bit too much.
Inner conflict is good, but the story is really (to me at least) about you finding her and finding out if you feel about her the way you think you do. (turns out you don't, and I was glad to see that...would have been too cheese otherwise)
Your dad was an OK twist, but what was great was the Ex. The fact she would resurface was unexpected and she was possibly the most interesting character for me. Both her background story and her reason for being there now.
The added element was her still remaining feelings for you which ended up being far trueer (if there is such a word) than anything Myste ever gave you.
Myste betrayal was not unexpected as this is exactly the impression I have of her and was her character which with us and away (who can forget Wook and others she alligned herself with).
Lander should have died. You should have crushed his skull with your bare hands as a final act of Darkness in you, and then you should have let her live with the knowledge you did that to Lander (the man she loved) and in the end she should have wished it was her and NOT Lander. When she wishes it was her and not you, well...then she should have picked you and she didnt right?
There is no better revenge than being kind (or light side) to her in letting her live, while still having given her the one most single moment of pain in letting her watch him die at your hands because of her!
Please keep in mind this i just my opinion and its nto worth much, but all in all I enjyoed it and the bomb was something that is not new (remember Bain used something similar) but was a fitting end to your life (not by combat which is refreshing)
I look forward to the other stuff and I hope Master Menelaos looks DAMB good in them =)
Regards,
Menelaos