Wow a huge compliment that you made a 3D Game in only 3 days that is something you can be proud of. The music is awesome I love that the music fitts so well with the form of the character that you are currently playing. Your idea reminds me of Doshin the Giant for the Nintendo Gamecube.
As you mentioned yourself in the comments there are a few bugs and the character is hard to control but im glad that you could allready fix some of these issues for a later Version of the game affter the jam ends.
The animations for the three different atacks look pretty good for only three days of work and i like that you added some light effects.