Hi!
First of all, thank you very much for playing the game, I'm glad you enjoyed your time with it.
Regarding your observation and feedback: I agree, there's the need to fine-tune the whole puzzle-solving and reaction-sensitive gameplay that can be a bit too much in certain parts of the game. If you found that section too much, from the save point of the blue area you can go to the right to have a less frenetic set of rooms.
Regarding the respawn, I wanted to make two different mechanics: for rooms that you can reset, you will respawn inside of it after death, for rooms you can't reset you will respawn at a checkpoint. This is a design choice, but I absolutely need to make it more coherent and comprehensible.
Thanks again for trying the game!