hrm is written in Rust, so you'll need to grab a Rust installation in order to compile it. Building is easy:
$ git clone https://github.com/nickelc/hrm-rs.git
$ cd hrm-rs
$ cargo build --release
$ ls -l ./target/release/hrm
hrm < floor.asm
hrm <inbox> < floor.asm
hrm - <tiles> < floor.asm
hrm <inbox> - <tiles> < floor.asm
a:
INBOX
OUTBOX
JUMP a
hrm 1 2 3 4 5 < example.asm
hrm A S D F 1 2 < example.asm
hrm ASDF 1 2 < example.asm
a:
INBOX
ADD 0
OUTBOX
JUMP a
hrm 1 2 3 4 5 - 0:3 < example.asm