I like the chart! intensity 21 is a pretty fair rating, but I'm not 100% if it's exactly an impossible map since it doesn't really force the use of two hands.

Some good I enjoyed:
- High action with good cooldown sections; barely noticed the length of song
- Contains single notes with high bat density + more complex patterns with easier monsters
- Good use of repetition. Gets the player used to central patterns

Some pieces of feedback that I noticed from my play:
- I would recommend the BPM changes to happen during held notes, especially for the second change.
o The first wyrms feel a bit off-beat during the build-up and doesn't prepare for what BPM is coming
o The black skeleton being the signifier is weird because there's exactly 2 on the map

- Change the bats to not land on the same tile as a wyrm; if there's an open column, looks neater and doesn't force double tap/ two hands
o The wyrms + following skeles are fine though because they're in a calm section

i will try it