Not bad
I enjoyed the game. The room with the disappearing panel, and the final boss were a bit difficult, but not impossible. The medals were a nice touch and fun to unlock. The animation is very retro as well as all the graphics, but it has a pleasant feel to it, and not frustrating or impossible. The sound effects were all very appropriate and the music was pleasing.
Overall the thing I wished mostly is that the game was longer, and maybe had more replay value. Maybe even a more challenging medal, or some secret rooms. A great game though, I enjoyed playing through it and getting all the medals for about 10 minutes.
Keep up the good work.