Yeah, no variation in grunt ounds can be really off-putting. I'm with you.

Balance the game more. It's not fun when, even with upgrades, even the first level enemies die slower than you do. I get that it's not Dynasty Warriors, but I dropped the game because I often feel more like an anemic child whacking at pinatas with a dollar store toy sword than I do one of the girls in RWBY.

Like... Make it so that in the singleplayer mode, it's like Diablo where the number of players and selected difficulty affects the numbers, strength and HP of the enemies. The singleplayer mode in the game feels like an afterthought, since the enemies in the singleplayer mode are designed with at least two players in mind.

Also, maybe instead of simply showing the playthrough stats simply adding a death to your total when you die, have a Sonic Forces style "TRY AGAIN" message when you die, then have the game auto-load you back to the spot where you last cleared a horde of enemies.