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The controls are twitchy, in an annoying way. Every time you press an arrow key, you had to press the opposite to straighten out again - maybe that's what you were going for, but it could feel smoother. Up and down was fine.
The track felt much too long, especially as neither the layout, visuals or music changed (except for the totally out of place dog bark about half way through -what). I didn't try endless for this reason. It could really benefit from a sense of progression by changing these things the further you get, or getting faster, as others have suggested.