Calico_Magica
This is my absolute favorite rhythm game HOWEVER the Steam release is utter garbage and you should not play it. It was a mediocre launch and quickly became completely abandoned in favor of the Switch release, Wai Wai Party. Play the Switch release or even the Mobile release (Free) for a much better experience.
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2016
If you wish to feel stressed playing a game this is one for you. I very much prefer being a survivor in these kind of games, but after the tutorial and practice matches I found killer to be fairly fun for me as well. I enjoy the fact that you can return to any previous event pass (i think thats the word but ill update it if i got it wrong), and the wide variety of play styles adds a lot.
A very highly moddable game and you might already know that, but the base game holds up well too. My first playthrough was fully vanilla and I got quite a lot of enjoyment out of it. Modding is definitely not easy, but if you have any kind of experience then you should be able to figure it out with a guide.
2016
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You should know that this game is NOT a rhythm game, and many people usually class it as a "music based platformer". The controls are incredibly simple to learn, just click. However mastering this game takes time and plenty of trial and error. Even if user levels aren't your thing, there is plenty of official content such as main levels, map packs, gauntlets, and more coming in the next update.