On Firefox the game lags horribly if I click too fast.
It didn't at first, but after a few minutes clicking too fast (no autoclicker, just mouse) it slows down to 1 click per second (matching the recharge rate) and freezes the browser until all clicks have registered.
That makes the "click X times" random quests frustrating to get through.
It may just be personal preference, but there's WAY too much dialogue in the first five minutes of the game. I don't feel like I'm playing a game when there's more dialogue than action.
Having to click and drag to select squares fails for me about half the time, and I'm using a mouse not a trackpad. It'd be a LOT easier just to click to select.
A bit too easy. Trap yourself into an corner. Trap the enemies into corners on the left side and on pieces with no treasure. Then you're free to collect the treasure at your leisure.
You can turn that off in settings (cogwheel button in top right corner), look for "Rivals surrender".