Seriously impressive! And even more so considering you went in solo!
From the start, the intro is really solid and hooked me right into the game. The game looks really nice, and the tutorial was very effective. Overall, the pacing is on point, so it's very manageable at the start, and gets progressively more intense as the game goes on.
The UI is amazing, full of absolute game juice. I really like the design of the upgrades menu!
The soundtrack is very energetic and makes the entire atmosphere very dramatic. By the way, the sound effects and the music work very well together. I was particularly impressed at how the music fades out and blends into the game over sound effect. I have no idea how you did that if it isn't programmatically.
Well done!