Another one with jetpacks: Dino Beatdown :) Found it on Steam.

Sadly that Dino beatdown has no demo. It's a shame, as it could be a fun multiplayer romp. Tribes 2 + Turok, with some visual inspiration from Halo? Sure, but no demo is a sign that the game sucks, and the creator knows it. That, plus the rumors I've heard about it...

For Giants, I'm on my first ever playthrough and I'm on the last mission as the dudes with the jet pack. I don't want to give it up, it is pretty awesome. Though the best jetpack game is definitely Tribes 2 Classic ;)

Exactly what I was thinking. Excellent game indeed.