Few things: First of all, the text is painful to read. Please use a font that's a bit easier on the eyes, and maybe has a greater contrast with the background.
Secondly, The fact that you have to find and enter a portal once you're finished with a level is a little annoying. Maybe it should just go to the next level when you beat it.
Lastly, there are a few things that might confuse people, such as an arrow that points to the spikes, implying that you should make the sinner fall into them.
If those things were fixed, I think this would be a much better game.