I've never watched any Hololive content so I have no idea about any of these characters or the "references". Still, I found this game to be a enjoyable beat 'em up experience. I have played "HoloCure - Save The Fans" earlier and that game has both quality and quantity in terms of gameplay variety. Compared to that, Holo x Break is rather disappointing at the moment.

cons
- No online multi-player option. Only Remote Play with max. 2 players. Up to 4 players local with online in an upcoming update
- No saves. If you exit the game, you're going to have to play it from the beginning. It is a short game - with only 5 levels - which takes around 2hrs to complete if you're playing solo.
- Combat is repetitive with no jump or combos to execute. Ability cooldowns are long and the charged attacks (which takes a while to do) need to performed while not moving.

pros
+ It is a FREE game.
+ It is fun to play with friends (I don't have any but I can imagine).
+ 9 playable characters that feel different to play (only 4 are available until you beat the game)
+ Characters and their animations are CUTE and the levels are UNIQUE and enemies variety is decent.
+ Music is pleasant and the consumable items, equipments and friendly NPCs are viable and fun.
+ Boss battles are challenging (at least while playing solo).