Uh, i don't know if this is a 2.15 glitch, but when i use silver, your icon, a silver tails, and derpy silver comes up when i run.
Also i cant use any abilities.
Odd. That sounds much like when a wad is edited using a tool like XWE and automatically turns lowercase letters into uppercase letters, making the life icon and such appear in place of many sprites. I haven't been able to replicate this with Silver, however.
As for the character itself, it was refreshing to be able to play as a fully functioning Silver character with neat sprites, and the abilities are a great change of pace to use. Good job.