Great game! Could use many updates and improvements.

I love this game! I enjoy how the courses align to the rhythm of the tunes playing (reminds me of Audiosurf). I love how Lindsey Stirling was incorporated into the game. I like how the difficulty level isnt too high, so its a lot less about white-knuckle tense focus (something I have to do in Geometry Dash) and more about laid-back having fun, with occasional areas that need skill (the arrow courses, I call them).
Now, here are the parts I believe need some work. I have discovered a bug with the Lindsey Stirling quest. After saving up 400-odd violins, I managed to purchase the first Lindsey Stirling costume, and was left with 1 violin. I would like it to be clearer that one PURCHASES the outfit with those violins, and it is not simply "now unlocked and available to use." Now, when I play the LS quest, I gather 30 or so violins, it says so on the "youre dead" wrap-up, it says so above the costume list before I start another run. Once I begin the run, the counter resets back to 1 violin. I have lost progress in this way 4 times now, and its really irritating me - Im pretty sure Ive gathered at least 200 violins, and they all just get erased.
Thats the main bug frustration. The rest I would like to put in this review have to do with features that should be included.
The songs get old... very old. I love LS, but please, we need more than 2 of her songs. I do not want to get sick of her beautiful violin dubstep, but it is approaching. More songs in general would be nice too.
There needs to be more maximum energy. At least, have there be an option to increase maximum energy by spending coins or diamonds (not by spending real money, please. PLEASE.). At the current maximum of 5, I can only fit in two runs before I have to wait 20 minutes for a third run.
On the raised areas (plateaus), where the character runs up a ramp to collect more items or step on more arrows, there are times when I die and get stuck below the plateau. Theres no way for me to get back up before my safety shield runs out and I die again instantly.
There should be a list somewhere that lists all the songs and has the option to not play some of them. Some songs I dont like, and asking the developers of this app to remove them entirely is just silly. Id like to customize the playlist of songs.
Even better, Id like there to be a feature where some of my iTunes music could be used in this game! That would be so cool to create courses based on my personal playlist! That would understandably take a long time to program, although Audiosurf manages it, so hopefully its a feature that can be implemented at some point.
Most of these are small issues I have with the game, barring the violin bug that has me clawing off my fingers with frustration. Overall, great game, lots of potential!
Psst... maybe the devs could add some Pianoguys music on there too? Lindsey Stirling and Pianoguys music go really well together.

rozieredz about Pop Dash - Music Runner