Gameplay is like typical mobile, just auto and shit.
F2P friendlyness, both yes and no. Getting a char you want is generally easy. You need whoreloads of copies of chars to have any sort of competitive edge/usefulness however, and event challenges tend to be bullshitty with some particular char almost being required to clear them.
Also powercreep like fuck. Star Festa chars are far stronger than the normal people and even "limiteds", and Ep2 chars even stronger. Some "symbols" are also godly as fuck and you'll feel like a gimp if you missed out on them.
Also worth to mention Ep2 dropping new characters onwards in battle not having a unique sprite/model that goes with the paths you picked is shit as fuck.>>138704
Game has fuckall that makes it stand out on the market and you can feel its struggling in Japan too. Won't last long at all in global, I'm sure. Specially with no PSO2 connectivity.