Hi, I'm the guy from the YouTube comment section, checked your game.
It's beyond my skill level so since you don't want players to get angry I turned invicibility for a more cozy analysis.
Ok so I'm gonna give my opinion:
Overall I like the idea, I won't give any opinion on the visuals because I'm sure they're gonna be updated, same with desyncing and performance.
The main menu theme really feels like a main menu, so that was nailed.
I also like the player ship design, it has a basic concept which it executes well and doesn't go for an overdesigned approach.
Now I'll mention the "negatives", and the word is on quotes as it's a little subjective and I won't blame you for not taking the advice:
First, it's very memory focused, the second pattern will hit the player if the player isn't aware of it, it seems like a memory focused game which altough there's no problem with it, that property seems to be in opposition with the "don't play if you get angry" as losing because of something unexpected might cause anger.
And lastly, there's no audio feedback, you may want to preserve the music by itself but audio plays a huge role in game design, the game feels empty without some audio, and even rhythm games which are supposed to keep the music "pure" still have audio feedback.
Despite this current version's state, I'll still give this a 5 star review just to help it get recommended to more people.