Questions:
A1/: gameplay is sometimes uncomfortable at the start
A2/: deco is repetitive in some of the structures
A3/: the level is too dark at the start and 2 seconds later it totally flangbangs you into pure blindness
Solution:
S1/: I would make the gameplay less tighter or less separated
S2/: I would take the first structure as a reference and then try to redo it without copying the same pattern
S3/: I would make the start a bit brighter and the second part a tiny bit darker