This was great. Making a metroidvania in 11 days is no joke. This was awesome and funny.
The color choice kinda was killer on the eyes. I doubt you would have had time, but a pallette option would have been great. The music was so good and the challenge was perfect for the length. Some sound options (sfx, music, overall etc.) would have been great too, but again I know time can be a killer for these kind of things.
All in all, great job. This was a lot of fun!