Thanks for the compliments! The intent of the dash mechanic was to allow for better movement but lack the ability to gain purity. The ability to regain health was actually implemented, except I accidentally made it so that it simultaneously added and subtracted the enemy's food value. This was an accidental holdover from when you would decrease a "Darkness" meter as the main gimmick instead of increasing a "Purity" meter.
I'm currently working on a new version that should fix a lot of issues that should come out a little after the jam! Thanks for playing!