Random yet almost predictable bursts of lag, even with low graphics and no music, especially on the hardest levels, can be really frustrating. With that said, I really enjoyed the game. Keep up the good work!
If I can't control a single thing during the battles why am I sitting through them? Please add a "skip battle scene" button. Plus this up so the developers can see.
If you feel you are stuck on a level try a different layout by going back to the previous level then coming back to the level you were on. You'll get a new layout and possibly an easier one too.
To make the medium badge less of a grind click "Championship mode" then click "User track championship" then pick "New tracks". That way many people may have not played those certain tracks yet because they are new thus increasing your chance of coming in first place and getting the 10xp.
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Hehe. You have to work for that lifetime leaderboard status. :D