I wrote it in the last thread, but gbf feels a few steps above most other freemium games out there. From the artstyle, to the music, to the fact that the characters are a bit more flashed out than just slutty stand-ins and they are all voiced.
If you want a specific grill on your team you can always reroll like mad, save for a spark or flat out shell money for her. Most other gachas don't allow any of this and want you to just keep rolling.
This makes the gacha aspect bearable at least.
Nope, roulette only. Whatever is left I'll roll as a bonus round. You might also want to opt out from this and keep saving for a spark.