Nice puzzle game ! The concept is really cool and each level is well designed, the atmosphere is good and I love particle effects. I just have gripes on the game feel, I think controls are heavy. I give you my advices if you would like make a full game :
_ Indicate with wires what buttons do (like portal).
_ increase movement speed and increase a little bit the FOV.
_ Give a bigger hitbox to get back easier the shard and give a more powerful shot.
_ Add more sound effects !
I hope it will help you. I really enjoyed your game, Nice job !