Positive: This distinctive article's presentation and quality are top-notch. Everyone wants to be a chronomancer, but worry that would be too broken. However, shooting things backward and forward through time is an elegant way of encapsulating this concept. I'm sure that traditional slow and haste spells are also welcome!
Negative: The only thing that bugs me is that causal debt applies to all non-cantrip spells, and not just levels 1-5. It would be great to see this sub-class along side several other quality presentations in a single book! :)
Overall: Articles like this are the envy of the community. I will recomend it to my friends!