Very polished and challenging! Reminiscent of the impossible game but the time constraints make it extremely punishing!
With the short level time and ease of death, I kinda wanted an instant restart key just so I didn't need to wait on the transition effects every time I took a bad hit on the more chaotic spawners. Also, not being able to use the arrow keys is a "bit" annoying, but that may just be down to my preference and the fact that the keyboard I use has a bad key that causes issues.
Some tools like the laser I felt challenge to utilise well within the time limits. Maybe if shift was a slow time instead of just slow movement so I had time to aim things it could help, or maybe I'm just a scrub. I think I most enjoyed levels where I didn't need to aim or aiming was always in one direction. Because levels start by zooming on on the avatar getting the "Right" aim was sometimes a challenge.