I'll take a look at the new version:

16yo Jance discovers he is a pyrokinetic alien hybrid when he is recruited by a covert government organization. When shifts in the earth’s gravity show someone is trying to alter the past, Jance must find and stop the culprit: a ghost from his father’s past.

"Past" is repeated. I worry that the first sentence will come off as tropey. I worry the last clause feels too tacked-on. Overall, however, it is very strong. I would probably use this and then perhaps test a second version. Here's the one I generated, if you like it. Naturally I might not have the details right:

When a covert organization shows up to recruit him, 16yo Jance learns he has alien blood...and pyrokinesis. Turns out he's the best candidate to kill the criminal that's toying w/the world's past... but the person might be a crucial part of his own personal history.

This adds a little dimension to the stakes regarding the negative effects of stopping the criminal without making us ask the question "what does his dad have to do with things?" If I had that wrong, then you could use the space for something else. This version also keeps his ability and bloodline from being shoved all together.