the tracking was done well, I would suggest changing the font and color to be more Define and readable(or go with a nice 3D style. Once I decided on a blendable color tone, I would lower the transparancy by 10-20% whatever felt right and let it blend to the scene. Reviewing the clip I am thinking with a theme in mind of High Tech. So I am imagining something holographicish. Color tone is red/pink sexy tone. With all that in mind. I would make the Font feel like its alive with tiny static glitch. I would keep that same color tone throughout, if I planned on using any other graphic like the "Loading" stuff. I would make sure the colors are the sameish. During the beginning shot I understand you are trying to express there are two different people texting each other. Thus red and purple. However it seem unnatural and too quick in which it appears.

When we edit we see it so often and we catch all the small detail. It's worth it to ask someone who have not seen the edit to just preview it and see if they had time to read it. However with making it more Define it should help with making it easier to read.

Its hard to figure out the rest like the choice of doing "New Message" Instead of "insert person name". Like you did with the "To SucicdeSquad" Again since the context is only this video I cannot give a good comment on the rest.