This is actually a good game, you've got a nice mechanic here. I won't review the story, I just don't want it. Here's what I got for you: sometimes you slide when standing on the edge of a ground. That's a little bit annoying. And when you switch realms, the player gets stuck in the ground. Maybe you have to change the hotkey for switching realms and throwing the trident. Sometimes I misspress it, and boom, I need to restart the stage.
What I know is that when you fight Sariel, the lighter purple platform is for the human and the darker purple platform is for the demon. At the top, you suddenly change the term, and this is so evil.
The stage fight with Sariel is insane for me. You can't see that purple platform, and you limit the shifting. I can't remember where the platform is or what shift the player can stand on it because we (the players) pace with the lava. You need to adjust it. Don't get me wrong, I'm still struggling with game adjusment too.
Good luck!