I have to agree that the automation tempo change just does not belong in this song at all. Coincidentally, I just started playing around with it myself. But, the way yours starts fast and then gets slow and then gets fast again is just pointless. If you want to try starting slow then increasing it gradually while simultaneously bringing the song to a crescendo, you might pull it off, but the way you've done it seemed very unappealing.
I think the first kick you used is too loud and the second one a little too quiet. So, find a good in-between and use it throughout the entire song. I like the melody and the sounds, the only thing you need to work on is the mechanics of your song.
Keep working at it! : D Don't feel too discouraged.