This is the song from the Plague Knight stages in the various Shovel Knight campaigns. This is a 1:1 port (as much as I could) using the 8bit instruments provided by musicalman. There might be some minor slowdown but I eliminated as much as I could without sacrificing the instrument sample switching.
The song has a constant/driving beat throughout. It could fit well in toxic or poison themed levels, as well as other themes.
I believe I'm hearing a few sections, such as around 0:36, where it sounds like two channels are playing the same note at once and hence it's being amplified, but it's nothing major, and I'm fairly certain the original does it anyways. Also, quick optimization note, but [cccc]14 is actually slightly more efficient as [[c]]56 (or [c]56 but that's like an insignificant difference, with the superloop being more efficient.)