"Sleepwalk" sounds so fresh and new, despite it being very old tune. This sounds so damn nostalgic, and makes me think of summers past. Good job for 4-track.
"This Time". I don't think I've heard this song before. Are these REALLY 4-track's because they sound pretty well mixed for 4-track stuff. I'm impressed. I haven't heard the original, but this sure sounds nice. The kick drum is a bit overpowering, but I guess you're not looking for mix critiques here, since these are your old recordings. You've chosen good sounds. When I listen to my first recordings, they sound god awful. I didn't know how to choose proper sounds. I hope I do nowadays. Anyways... What am I rambling about...? Good song you covered here.
"The Deep". Weird spooky stuff. I guess that's a guitar with LOTS of effects in the intro. I think you got a little carried away with your effects apparatuses

Oh, in the middle part, the song starts to evolve. This sounds like an amoeba is evolving into some life being slowly. Just floating in some slimy goo, and sleeping while there's a thunderstorm above (eh?). I just hope that middle part would have taken over the song slowly, and morphed the song a little, but this is still interesting. Not to be listened that frequently, but a relaxing piece. I never can't get myself to slow down things like this on my recordings. I'm too hasty.
"Doin' 60 in the 80's". Now this sounds a bit like my older Zoom 505-II recordings, before I discovered Revalver. This sounds A LOT like them, really. Only you're playing better. I was horrible then, and I'm horrible now. I'm just skilled enough of an engineer to cover my tracks

More cut & paste nowadays. Too much reverb on the drums, but I remember I got carried away with the effects back then also.