Just listening to it, would be good to normalise this as its just a rough track, just so you can listen to it without cranking the volume. I wouldn't suggest that for a final mix though
The Rivera
Definatley improve your playing together skills. To me it just sounds like a really long guitar solo with some sound effects at the beginning, as there seems to be no structure to it. The intro is good, and I would disagree that the cut is a bad thing. It could sound good, if you had a nice mellow drum beat starting up instantly after the cut. You need to quieten down that guitar! Or bring everything else (the bass?) up, because its not even nearly audible. The guitar really needs to be EQed better, because it just doesnt seem to have any.. well... tone to it. It sounds like it could be a decent amp so take advantage of it! EQ the amp nicley and EQ the amp mic as well. What mic are you using for it? Either you havn't set it up very well, or it just sounds awful.
I know you said it was a rough mix, and I realise that its a low bitrate mp3, but raw audio like that is going to be really tough to work with.
I've had a play with it, normalised, compressed it at -18 (boost 18dB), EQed it to reduce the bass a bit, and boost the treble range a lot, compressed it again. The guitar sounds alright now, but the bass is still way too low.
The Forge
Again, lacks structure. Guitar sounds better here though. Bass is STILL too quiet. You need to get some rhythm into your playing, which the bass can do, if you let it! Practice practice practice! Get it tighter! Also, the tempo seems just a bit too, slow and lothagic. Speed it up a bit and make it sound like you're driving it forward, not sorta footling about. Drums could really do that for you. Get a permenant drummer, and practice with him/her! Make sure its a good one too, one that can play to a metronome well. I tried to tap along to the song and it was going all over the place.. try using a metronome yourself!
There you go. I wasn't lying to you, because in all honesty I think you have a LOT of room for improvement here. You do seem to have good potential, so work at it!
PS : Don't think that I don't understand prog rock structure, because I do, and it ain't like that! Dispite what it might seem like, its the same as normal rock structure except manipluated differently.