Nicely done platformer for a weeks work.
I hate platformers though so I gave up in the first level just before the end - I think I have to jump over the guard just as (s)he turns around but having to restart on each fail was too irritating for me. Maybe make the first time you have to jump over the guard a bit easier.
Also the text was difficult to read in full screen mode. If you change u to "you" that should make it more readable.