People. To beat level 15, jump from the platform in the top left corner with your mouse already trained at the platform below and to the left of the electric field. Then at the height of your jump, shoot a portal there. then make a portal where you are and JUMP in it. then press R to clear both of your portals once you are through. Now from the platform by the electric field, shoot a portal at the top left ceiling. Shoot a portal under you. DO NOT CLEAR YOUR PORTALS. Now shoot a portal onto the platform directly to the left of the window. Wait for the electricity to turn off. Jump in the portal on the platform, and you'll be shot up out of the portal you made earlier near the electricity. Hurry across the electricity, and jump to the exit. IF THIS HELPED YOU PLEASE VOTE IT UP AND KEEP IT ALIVE!
Pretty good :) My only suggestions are, improve the graphics in general, make it so that the enemies do not spawn on the buttons, and make them move around and fight back. Great for a first game!