I only watched 3/4 of Wonderwall but can probably still give you some yays/nays:

Good:
You have a unique voice, if you could write a cheesy song a la 'Hey There Delilah' you could be famous the world over maybe

Bad:
As said above, you need to take a bit of creative liberty with covers. Even more important though, is you don't seem to care about regulating the volume of your playing - by that, I mean you need to mix in volumes of very quiet to very loud, to build emotion and story into the song. Wonderwall had pretty much the same volume throughout, but there are a lot of opportunities I think on that song to have some quieter, more intimate, parts as well as some loud all-out parts for the chorus. (just make sure you have the ending chorus end in an exasperating calm quiet! Cliche, but it works!)