Heh, at least it wasn't the unendurable I VI IV V. I don't think 4 chord patterns repeated over and over every really sound very good and especially not in something purporting to be classical music. All the sounds were very crisp and clean so that was nice, the piano did sound a little artificial but it wasn't terrible. I liked the string instruments timbre. The drums were almost an anachronism when placed with the other instruments, far too heavy and synthesized sounding. In all honesty i don't think there were even necessary, in replace of them i think a more varied song structure and clearer progression would have enhanced the song.
Now i don't want to criticize this too much because you said you made it in an hour so obviously it's not going to be a masterpiece. That said perhaps music made in an hour is best left of the portal? I suppose it's a nice enough piece despite it's simplicities and flaws, i can imagine someone using it for a jolly scene in a flash. Good luck with future work!