I put my first recorded original song up on my profile, called trouble magic. C4C, crits are welcome
Ok, critique:

Guitar first. Two problems with the guitar. One, tuning sounds off. Two, your strumming isn't flowing consistently. You sound stiff. Loosen up, relax, have fun with it. It's also possible that you could use some new strings.

Vocals. Way too restrained. Almost a mumble. Let it out. This is the main problem I find with cats tryin' to sing. They sing from their skulls, instead of their torsos. Don't be bashful, let it out! Bring the source of your voice down into your chest/diaphragm so it has some resonance.

The song sounds ok, I'm just betting you can give a better performance of it.

C4C (a chance to rip mine apart):