Update 5: Version 2.2.1, performance is still garbage compared to 1.x. Been recycling the same accurate review for 14 months now, shocked you guys even bother to update.
Same ol review with present day revisions: Version 2.2.1, same. Absolutely terrible support, performs nothing at all like the 1.x.x versions. Or the 2009 Nintendo DS game for that matter.
Frame rate issues, animations and loading screens/transitions are rough, and upon closer inspection graphical artifacts exist such as lines/gaps between sprites (see 1st retro level for example.)
Versions 1.x played flawlessly on my iPhone 5; 2.x has just been unplayable for me (under iOS 6, 7, and now 8.)
Really dont see the point of these updates if all they do is break what used to work. Clearly this wasnt ready to be updated and yet you release it anyway, unoptimized and untested; this is greatly concerning to me. I had hopes it would improve, but 14 months later Im convinced you really just dont care. Not a good game plan for success.