Enjoyable
I think the echoey guitar sound works well but when the synth sound comes in it all sounds a little generic. The entrance of guitar and drums adds a little more interest but all the the rhythms are a tad simple and repetitive. The sounds flow into each other a bit to much and this along with the static harmonic progression this makes for a slow piece. I can imagine female vocals over the top really improving this. The song structure is a little simplistic and i think having shorter fills or pre-chorus riffs could add a little excitement, everything seems to be hanging on long four chord sequences. The sound quality is nice and the mixing is good. I enjoy the panning at 3:00. Good luck with adding the vocals, i think you've got some potential here!