Parade Buster is an interesting premise that was executed very well... but not perfectly well.
I had an extremely fun time with the game, despite so many things about it could have been better.
Let's start with the things Excessm did well:
1. The H content: There are a lot of of scenes that you can enjoy, though it lacks a good gallery mode which only practically exists as arena mode. It's good, but I prefer if you can directly manipulate and switch around the main H-attacker and the two sides instead of having to change enemies by exiting arena mode and then re-entering it every time I'm satisfied with this enemy's scene. Still, better than not having a gallery mode, or even a worse one if there's a chance the dev can mess that up. The H-events is also serviceable, if you're into Onee-san domination through texts, you'd love it. For me, I just wanna see exclusive H-scenes, though there isn't much of that in H-events.
2. The diversity of gameplay: I love a game where you can use a lot of strategies, and where you can express yourself. It's a surprise to me that Parade Buster has loads of weapon synergies and the mechanics surrounding them, each with their own pros and cons. Despite the gameplay might be a bit... stale (I'll get to that later), the weapons really doesn't bored me and in fact, this game might not have such a high score if attacking was boring.
3. The story: Now I'll admit, this game story is a bit... generic. But I assure you the main plot is consumable, but the better part is the sidequests. There are some fun ones and it is really entertaining going through some of them, the sidequests overall have some nice challenges and I always appreciate a good sidequest system. But, I do think giving a bit more personality and story to more of the enemies would be interesting, there are some of that already but they are a lot less than what I expected.
Now for things Parade Buster is good, but could have executed WAY better than it does now.
1. Counter: In this game, there's a mechanic called Counter. There will a circle on the enemy and if they are about to attack, the circle will turn red and clicking it will you a Counter. Now why am I telling you this? Because this mechanic is simultaneously a very good mechanic and also a bad mechanic. It's good because it gives reward for players who are now good at reacting to the opponent, it's bad however is because it breaks a few rules of the game which I wish it didn't. It ignores armored enemies which was stated to only be damaged by armor breaking weapons, it gives Flash Counter, which is basically invincibility.
Flash Counter is also a thing I don't like, as you can stack them, giving you an absurd amount of invincibility (up to somewhere around 10 seconds of it, which in gaming terms, means that you are an immortal), basically rendering blocking useless.
2. The enemies and the their mechanics: Now I think the enemies are great, a great deal of mechanics like armor, ranged enemies and healers. There's also innocent targets which you mustn't hit at one point, which spices things up a little bit. And the twin boss is also interesting at a strategic level, testing your knowledge of the game. They're all fun, but I think it could have been better. Like I said, Counter and Flash Counter is a big contributor to this point, and I think it could have been more interesting to see some enemies force you to not rely on these mechanics. Flash Counter would be way more interesting if there's an enemy that depletes it, forcing you to focus on that enemy. Or even one that BYPASS Flash Counter, forcing you to use Block, basically an extremely underused mechanic in this game. Armored enemies might take less damage or even not get instant killed by counter if it wasn't an armor breaking weapon for example. Other than addressing Flash Counter, introduce more interesting concepts like Couter enemies, ones that you shouldn't hit as they will counter YOU if you do so, maybe let some debuff you, etc. There is SO much more you can do with the enemies in this game which the Excessm should have consider before making 60% of them the same.
3. Difficulty: There's 3 difficulty and an extra one if you beat the game on Hard mode, Lest Buster. Now you might not agree with adding those sorts of mechanics into this game, but if they shouldn't appeared in the main game, at least introduce them into even harder difficulties, making you re-learn the game and further intensifies and also add fun to it should you agree to beating it again. But regret to inform you that this is easily the worst part of this game... it's boring up here. There is nothing new, nothing interesting, no new content, no new weapons and armors, nothing. The challenge in the Tower of Winged Phantoms (aka post-main game content) and Lest Buster difficulty is just that enemies one-hit you (Flash Counter, doesn't care) and they have a large amount of health, and when I say large, I say HUGE, ABSURD amount of health. All it does it takes more time to spam counter with your best weapons on the boss. It really isn't worth it. Excessm unfortunately does not know how to make Lest Buster interesting at all, and I recommend you not to bother with it unless you wanna brag about beating Tower on Lest Buster (which I'd still congrat you for doing so).
With many drawbacks and unexplored potential, I believe the content itself is still amazingly fun and enjoyable. I recommend you having fun with the game and only stopping at the point you felt the game becomes boring, because it doesn't get any better at that point. Overall, 8.75/10.