Impossible difficulty: monsters on beats 178 & 487 now have proper shadow (they had star-shadow which wasn't intended)
Shout to Squidoss for noticing and reporting that!

Impossible difficulty: added missing notes at following beats: 156.5, 172.5, 191, 205, 344.5, 368.5, 379.5, 396
Impossible difficulty: removed some (4) shielded skeletons from following beats: 258-259, 512
Hard difficulty: adjusted notes at beat 190.5 (notes that were placed on beat 190.5 were moved to beat 191)
Why?
Impossible difficulty were adjusted according to feedback. Mentioned beats really lacked notes so missing notes were added. 4 shielded skeletons from beats 258-259 & 512 were removed for sake of keeping already existing results relevant (total amount of notes wasn't changed, it's still 912)
Hard difficulty were adjusted according to feedback too. Now pattern should be more consistent (now beats 190-192 match beats 379-381)
Shout to xheepey87 for noticing and reporting that mentioned beats lack notes/notes on mentioned beats are placed a bit off!

Hard difficulty: small consistency changes at beats 510-512 (now blademaster at beat 510 1/2 bumps into other monster instead of jumping one tile back, just like other blademasters in this section)

Impossible difficulty: blue armadillos were refined into shielded skeletons + 1/4 regular skeletons. Don't worry, this change should not affect existing scores cuz total amount of notes (912) was not changed
Hard difficulty: blue armadillos were transformed into shielded skeletons
Why?
The song doesn't contain any triplets. Quarters were misidentified as triplets. That's why armadillos were removed and replaced with shielded skeletons and 1/4 regular skeletons
Shout to ari6037 for noticing that and suggesting idea how to fix that!

Impossible difficulty: fixed unintended star-shadows on following beats: 90, 142, 366, 420, 515. Shout to Squiddos for noticing these mistakes!
Impossible difficulty: removed unnecessary enemies near heads of wyrms (hit wyrm + hit 2 other monsters pattern were changed to hit wyrm + hit 1 other monster)