Hey there! I'm one of the creators of this game and I'd like to take a moment to critique my own work since it's a great game design exercise and I never see anyone write on their own game!
I think the game mechanic idea is very good! However, there's no introduction of the mechanics given to the player. I wanted to make a level where you're taught how to play the game and how the mechanics work but there was no time to implement all that, sadly the player is just thrown right into the game. Even adding a "How-To-Play" screen in the menu would have been sufficient enough. The boss fight is cool but he has way too much health, in retrospect I would have given him a lot less health. In the last phase of the boss fight, you have to shoot at the cores on the sides of its body but that is not visually obvious enough (perhaps I should have added arrows or highlighted that area of its body somehow).
The music was awesome and I think it complimented the sci-fi and progressive game idea, I've never seen a rhythm / FPS game before. I was especially proud of making the procedural animations on the boss and making it do that shockwave attack in sync with the drop of the song when it hits.
I think the level design of the bridge area could be a little improved with it being just a big open space, the enemy's AI in that area doesn't compliment it either (the soldiers don't shoot back at you if they're too far away and the bugs don't pose a threat because you can just shoot them enough to kill them before they can even reach you in that large open space). The first room area is nice, there's cover to hide behind and different paths to wander through while fighting the soldiers and bugs. The very beginning hallway invoked a small feeling of claustrophobia in me.
The UI could have been a little polished, I wish I had time to replace the default font on the "Ammo" and "Combo Count" HUD. The health bar looks a little flat as well.
The health bars on enemies would have been a great idea, credit to all the feedback in the comments!
All these issues could obviously be resolved if we had more time, but this project taught me a lot of great lessons in the process of making a game. I never worked with code so closely related to audio in Unity! Cheers!