This is a tough one - I don't have a lot of genre literacy, and so I feel like I'm not the best person to speak to how well this balances working within genre conventions against subverting them.
This feels solid for the most part, but in my mind takes a little too long to get to its point. I took new weapons over upgrading existing weapons, so I *think* I took the shortest path to the end (the bottleneck seemed to be how many enemies were within firing range rather than how quickly I took them out). If I hadn't spotted that there was some kind of ending, I would have likely stopped playing much earlier.
I mentioned while streaming that I think this was the least engaging of your team's submissions over the years, and I want to make sure I highlight that that's a statement about the high bar set by those previous games. I'm still giving you high ratings here!
As always, great to see sources. I'm going to assume that "aftermath" from the optional prompt list provided some inspiration, and that helps draw focus onto the ending/give it a little extra resonance.