OK, I've played Xeia now. Below are a some hints to help with your question. The walkthroughs give too much away when all you're looking for is a hint.
Get just one key at first. Then you must go to another location in the level.
You'll succeed in the level by getting either key first, but I'll advise you get the blue key first. The purple key will require you anticipate a quick action to proceed.
After you get one of these keys, go to the screen that is located to the right of the screen where you got the red key.