At the beginning, I thought that the melodic line was too simple, but when the heavy bass came in, it was good. The addition of the synths made it really good, and the piano break made it great! I must say I didn't see that coming, after the break I was expecting some sort of acidized bass line, and then you hit me with the great piano line. Really interesting turn of events, I might say.
I loved the way the melodies melded with each other to form a really good feel. However, it can be seen that you ran into this 'block' that you mentioned, it does seem to end a bit abruptly.
As for the continuation of the song (should you be planning any), I would suggest taking all of the instruments in the last section and repeat their lines, and then stop to a no-drum pause with a combination of two sounds that weren't used in a combination where there were only the two of them, e.g. the piano and the first synth. That should build up another 20-30 seconds at least.
Very good stuff, nice job!