Soundfall

i am simply not good enough to play above the lowest difficulty. however, the game still is great - covers a great range of music and locales, while cooking up gimmicks for each environment that are mostly not repeated

gameplay is tight, rewards getting better at the game, and is satisfying to pull off

a good time all around

Cute game, and a pretty chill/easy time to run through. Just be aware there is a lot more content in here than you would expect

Its fun both alone and with friends. You can import your own music but the generated levels aren't as good and unique as the actual campaign levels.

this game is so amazing, firsttime i play this game and it’s so amazing. can import songs if you want!

fun rhythm game, i can shoot things on beat, so fun!!

I would give this game a qualified positive review.
The true selling point of this game is the ability to import your own music and then jam to your tunes while mowing down enemies. I found the rhythm timing fairly forgiving and usually did not have any problem. Some songs just seem to have an invisible beat, but maybe that's just me. I'm sure a drummer or real musician would do better. I had the most luck with extremely heavy bass and drum sections jamming the beat into my ear in an unmistakable way.
The story feels rather bland, but some of the characters are entertaining.
The statement that there are 'hundreds' of weapons is blatantly misleading. In reality, there are perhaps a dozen weapons which have different ranges and firing characteristics. Notably, some weapons are single shot, some burst, and some are actually automatic, which you won't find out unless you hold the button down after nailing the beat. I also liked the small selection of music/weapon flavors which give some good options for better destroying my enemies.
The bullet hail nature of the game runs counter to the need to maintain a smooth and steady beat for attacks and dodges which can become extremely frustrating when you are simply not allowed to dodge effectively often enough.
After attempting a co-op run with a friend, I agree that the game is a single player game that you can bring a friend to. The lack of split screen when playing online is a travesty. The forcibly limited scope of the camera makes multiplayer a frustrating experience which immediately highlights the clash between bullet hell and smooth on beat behavior. This is exacerbated later in the game when large trap installations limit the usable screen even further, which is a recipe for failure when you're trying to outrun a laser and suddenly the screen won't move because your friend is on the far side of the available camera area.

A decent rhythm game.
Has a very big variety of songs. That could be a problem if your music tastes are singular.
The story moves things along, but it's not something spectacular.
Difficulty can ramp up quite a lot, but only if you choose to.
I recommend if you have time to kill and want to listen to varied music.