Tip: Make sure that ALL exit-enabled pipes, doors, etc. have a screen exit defined, or they'll take you to Level 0, the "endless" bonus game. Unless Start+Select is enabled, the only way out of it is to reset the game.
No issues found, so, accepted. One interesting (but probably unintended) quirk of the block is that if the act as is set to the vanilla note block (113), hitting the block from below will cause the block to shatter into a standard note block. Hitting it with sprites from below or the side, or a cape, will also make it do this, but without the shatter effect. During moderation I added the lorom and sa-1 tags.