I beat the game even with the bug, however it can and does affect gameplay.
There's 3 different fields of view in the game.
- The Cutscene view, where you see your character as though through someone else's eyes facing him.
- The Dungeon view, while in a dungeon, you have this view, you're able to jump and use weapons.
- World view, This is the buggy one, the view you take while traveling in the world.

The bug is basically, that when you're in world view, you can walk through walls and objects when you move towards the right. (->)
Walking onto stairs while moving towards the right causes them to not register. And can cause crashes in some areas. I can include screenshots if needed.

Thanks, SainT