Sure there could be some changes but the core activity is good. This beats the season activities of perhaps the past two years. Fun, challenging, good rewards - I'll be back for more.
For a more detailed critique, I'd suggest checking out the other posts on the discussion board.
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It’s alright to me. Not bad in any way, but I already got bored really quickly after wave 20. I’d like a system to be implemented similar to rivens lair where you can purchase upgrades for your guardians like increase ability regen etc.