Ok. I had some problems with your game at first. I played it on my 144 Hz G-Sync Monitor and the dash button press did not register correctly. But to your luck, I also have a 60 Hz monitor and there the dash was registered correctly. So I was able to finish your game.
I have to be honest, I did not really get the story of your game. But let's start off with some positive stuff. Your Level design is very good. I know from our game how much time it takes to design levels. Especially if you have upgrades or new abilities. I also liked the idea of getting a new ability after the first play through.
Unfortunately, I only played with the new ability for a few minutes, because I already played it two times because of the monitor issue. Additionally, I really don't like the characer controls. It's way to floaty for me. So this is something that I would change. If you like it that way, it's ok. You can't make everybody like your game. I also think that your enemies should die faster because there is no real reason why they are in the game in the first place. Most of them you can just ignore.
But hey, awesome job for one week. Especially because you did that alone.
I have one question. Do the gun and shotgun deal the same amount of damage? Because they felt the same.
Maybe you want to checkout our little platformer too ;)