Prototype review: Inside

This is Max Martinez, and for the prototype of the controller, I made a helmet lo-fi model for the game inside, The helmet uses the PE's accelerometer and light sensor for movement and grabbing objects, The game functions mostly movement vertically and horizontally and I used the accelerometer for that. The idea of using the helmet comes around because the same helmet can be found in the game and you use it to control other people to follow your own movement so my helmet looks to mimic that as a controller for the main character. For feedback: 

1. Apart from getting a helmet what things could help in the final product design?

2. Is there a way to make movement more responsive and have several keys pressed at the same time?