Can't go wrong with a good game of scramble. I liked the power ups system. Really cool and ambitious project and what a cool idea to have it in multiplayer and seeing what everyone else came up with. A lot of time and effort went into this and with a bit more time this could really be a fantastic full release. Keep working on it and good job!
As for the pickup system in my game, it should work. You just need to stand close enough to the weapon and use 1, 2, 3 or left or right on the D-Pad to switch between primary, secondary or melee weapon. I downloaded my game and tried it for myself and everything works as intended. Keep me updated if it works for you!