Would be excellent IF

The "featured" option ( Difficulty Level, Instruments option, etc.) Werent Locked. Seriously, Im supposed to pay money to "second chances" to tap the same sequence over and over? If that was how a GAME on enjoying rhythm or even with the purpose to learn*, then Give the option to pay to unlock the darn difficulty levels..
Otherwise Id love this "game" very much. I even use it as tool when Im stressed, and it helps as a peaceful way ... almost as if it a decompression mode to put youre mind in ( if technology cold implement such a button..)

LuLu Press about Rhythm Repeat, v2.3