As others mentioned the spikes were definitely hard to see. It also would have helped to have some more obvious visual effect when that first set are taken away by the fire door.

I also wished the camera stayed a little more centered on the character. Early on especially I felt like I running into an area I couldn’t see and therefore couldn’t really react to. That may be a part of the problem with the spikes. And that was probably exacerbated by not having checkpoints.

But ultimately, those things didn’t stop me from having a good time with this. I really liked the mechanics here and I think you did a great job of teaching them and introducing some interesting interactions. I also liked the mash-up of ninja and modern surveillance aesthetics. The music was also great. Really intense and very fitting to the setting.

So in the end, some rough edges, but nothing too difficult to smooth out, but otherwise great execution of a cool idea. Nice work!

one-hit kill spikes which blend with the background were reallyyyy severely punishing as a player. I was frustrated having to restart the entire game when I mistimed a simple jump. I wish it would have just put me back before the spikes, or just did 1 damage instead of killing me, so I could have kept progressing and gotten to the cool part

Really cool concept and art, but there were a few things that got annoying: 

The spikes were quite hard to see, especially when the camera pulls out.

The long hallways at the start of each level make trying again a pain.

The front edge of the camera is really close to the player so you can't see ahead of you very much, pulling it forwards so that your character is in the center (or in the back half) would make platforming much easier.

The vibes were awesome and I the puzzles were good, too, though!

Spikes just out of view makes for a challenging start. Would love to see a look-down camera when the player is on a platform, or some sort of lookahead camera in general.

Nice use of doors as all kinds of activation triggers.