Dying to a stargate is intended, in the show if anything is caught in the unstable vortex it will get annihilated, if he was being more faithful to the show your items wouldn't drop either.
To answer the question, the "stargate Dial-Home Device" (DHD) taking from the changelog "if you want to use it, figure it out. No tutorials. That's how they did it on the show! :D (Tip: Feed it the letter "Z" to help learn it)"
I know how it works but Pyro has told us not to share how it works, soooo figure it out yourself... :)