WOW, it is indeed a great game. I really liked the movement and its animation, you did it great - especially this momentum you have upon jumping. This thing is rarely found in games.
Music was nothing super special, yet fitting and soothing, so the game did not get bored.
IMO block reveal range should be increased, sometimes it is just not interesting to die 10 times to understand where to go (as it was on the first level).
The game is called OBSERVATION, but in fact there is nothing about observation besides a few people standing behind the glass wall on level one. Maybe some comments upon player's death would make it more "title-fitting".
Overall, it is a very nice small game I liked a lot! I want to point out animations of movement you've done - it's superb!
If you have time and interest, I'd be really glad if you rated my submission.
Have a nice day!