Hey Ronnie. Actually, I think it sounds really cool! You rocked it out!
As for how healthy it is...probably not very healthy. Then again, lots of pop/rock singing isn't, so it's all kind of a balancing act. You need healthy habits (most importantly, rest, water, and a good warmup/cooldown) to go along with the unhealthy ones.
Your voice is the best barometer of how damaging your style actually is. How long can you go on singing like that? Are you tiring out very quickly? Do you feel any discomfort or tickling in your throat? Are you hoarse after you sing?
To my ears, it does sound a bit strained. (Not saying it sounds bad - rock will sound strained sometimes. That's the nature of the beast.) It sounds like chest voice to me, that you're pulling up and you're letting air leak out through your cords, creating that breathiness. I would recommend finding some vocal exercises that emphasize support and cord closure. Those two things will allow you to stretch the range with much less effort.
You have a great voice and it seems like you care about keeping it that way, so props to you.