I think if you added two more rays to the area that doesn't always get any it'd look really awesome.  I noticed that especially on the second one.

Also, the exit blob looks a bit out of place compared to the geometric lines of the level and the epic jumping spinning flashing (?) character -- I'd think the exit sprite would look cooler if it were a bit more geometric, like a collection of oscillating/expanding/shrinking rectangle/squares/circles or something.

Also, it it just me, or does anybody silently hear/pretend to hear a sort of boom-boom-boom-boom shaking sort of noise when the rays shoot out and the screen starts shaking?

An idea also came to me: after the rays appeared, you could erase the screen then redraw it without the portal and the character, like if he was teleported in a flash of light.
This is just an idea, note that I don't tell you how to make your game.