Daily quests should have better rewards. A freaking minor revive potion today for clearing 3 dungeons with no onther player? Those potions drop routinely for me.
I gave it a 5 star because it lacks the usual annoyances and it's not pay-to-win and it looks pretty. A mute button as soon as there's sound in the game is also a huge plus for me as I always have something else running in my browser that I want to listen to - like music or radio or an e-sports cast.
The game could use a lot more polish when it comes to gameplay though. I finished it easy with the first 4 monsters I've uncovered for instance, there's never a real need to hire more. If you would hire more it would suck to have to train them though because you start from scratch. A system where they can merge with your existing monsters and take over some of their training would be nice. Or eat them or something.
I think that each wave should start like a normal battle, instead of sometimes monsters getting the first turn. It's incredibly frustrating when I accidentally clear a wave with my last character and get owned by the subsequent boss wave.
Achiever 1 and 2 seem to be bugged. I've completed all achievements except "destroy all targets in 1 run" and "destroy the wall", then I did them both in my last run, got the achievements on the screen but still no "achiever" medal ... same with Achiever 2.