Thanks for playing and the kind words! :D
Yeah, we've had similar feedback regarding difficulty and arrow positions :) For the difficulty we're thinking of maybe introducing a practice mode that'll allow the player to adjust the playback of the track, this way they can get used to the note chart for each level (we've got another couple of ideas too, but they still need to be fully thought out). For the arrow positions I think we're going to look into allowing the player to customise the positions so everyone can organise them as they like :)
Thanks again!