Regarding the acceleration, my suggestion would be to include some speed up, but maybe not as fast as you did. Do a more gradual ramp up as the player goes along. It wasn't that it was bad; it was unexpected. I really liked how it made the game harder, but being more subtle about it would help.
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I agree with you. During the playtest I thought this acceleration was very abrupt, but the people I asked to play didn't say anything about this spot. So I figured it was fine and I was imagining it. I sped up there also because I was trying to get into the rhythm of the song. I'll take your advice next time! (ღ˘⌣˘ღ)