>>99666515Just off the top of my head...
The game is way too horizontal focused. There's very little you're given to deal with vertically aligned enemies which creates a problem where you have to be extremely precise with your horizontal positioning to consistently hit. Many good BEUs will give you some kind of circular attack to deal with a swarm of enemies all around you even if it has a cost to it.
Way too many ranged enemies. A golden rule is to not have more than one or two ranged enemies active at a time because they're meant to be something you calculate risk vs reward with. Do you stunlock the five guys right in your face with a combo or do you try to get around them so you can divekick the asshole in the distance throwing knives at you? Holo X Break swarms the fuck out of you with ranged enemies to an exhausting degree and you don't have the proper tools baked into character kits to deal with that.
No dead zones on the sides. You can run right up against the edges of the screen during combat encounters which creates numerous problems in regards to readability and AI behavior. When you allow the player to touch the edge of the screen that means you're allowed to be in a position where you can hit enemies off the screen. This leads to one of two issues; you don't allow enemies to fight back while off-screen which makes the optimal strategy to combo them against a wall and repeatedly attack the air until they walk into your fist enough times to die or you do allow them to attack in which case you're going to take cheap hits from enemies you can't see.
Enemies have no random behavior. You don't even need complex AI for this; there are good BEUs from the arcade era where enemies have just enough AI patterns to create dynamic situations which encourage you to swap priorities. In Holo X Break everything just wants to zerg you. All the enemies have very basic "hunter" AI where they follow you and attack when close enough; at best they may make a random pivot before going right back to stalking you.
These are some of the basic things but there's plenty of other finer details. The foundation of the game is fine but there are so many core components of the genre that it gets wrong. It can keep the character kits and items and leveling/upgrade system. The main problems involve the enemies and a lack of situational options for the player.