Fun character voice. Strident with a little bit of petulant thrown in. Neat point/twist about not being able to go back forward.

I like that you took the time to figure out the power. Great job.

Wow, this really opens itself up to some interesting stories. If the protagonist can only travel backward in time, that means that, the more he uses his power, the further back he goes, and the further he gets from his own time. Fascinating!

I’m not sure if it’s the character’s voice or what, but I think you mean ’cause not cos. Other than that, this has potential, well obviously, since it has a sequel.

Yes, the “cos” is because of the character’s voice, ‘cause that’s how he speaks.
Sorry if that gets in the way of enjoying the story fully.
=)

I like the constraints you’ve placed on the time travel. I’ve not come across much time travel fiction with such constraints.

Also, I enjoy the sarcastic wit you’ve imparted to the protagonist.