I can't tell if this was meant to be a rage game because it does have some elements that point in that direction. If not then I would advise against putting fake blocks and spikes in a platformer unless there's some way to identify them. Other than that the game controlled really well and had unique level design, good stuff. Also this might be a nitpick but if your game is 100% keyboard gameplay, don't make the player use the mouse to restart the level.
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I am so thankful for your detailed feedback. We get a lot of feedback about retry button and that is my mistake to forgot to add a shortcut to retry button. In the level design we wanted to surprise the player in some levels but we thought if we do this in every level it might hurt the enjoyness but we still couldn't make it perfect. This game is first project of me and my friend and we want to be better in what we do. We have some good ways but we are lack of some points, for this reason your feedbacks and your opinions are very important for us to improve ourselves so thank you once again.