The most recent update of the game mentioned "several improvements to the limited time arcade mode ‘Frenzy’. "
I have had no idea that Frenzy was limited time only so I haven't played it much, why would you excise content that you made for your game? Limited time? Please just keep it available for us it's a fun side-mode and I want to get into it when I have the time but I work a lot.
So I'd feel insanely shorted if some day Frenzy mode magically disappeared before I'd gotten to enjoy it. Thanks for all your hard work devs, love the game!