Okay, so I'm a new speedrunner and my first speedrun is going to be the ios game swordigo. Because the game has no save states I use my completed account to test quickly getting bettween places, I will then test the bossfights on a seperate account is this a legitimate way of practicing for a speedrun? Please tell me.

No one really cares how you practise, it just needs to effective, or it should at least...

It sounds good for me.

should work fine for your purpose - although in the end the most practice (and muscle memory) you'll get from doing the full run anyway.

I am WR for that game and stoked you want to try it. The discord is https://discord.gg/4v9CGAf where you'll certainly find help with the run generally or feel free to post any issues / questions on the game's forum https://www.speedrun.com/Swordigo/forum (there are already one or two threads there discussing the route and some guides). Your proposed method of practice sounds sensible and good luck!