OHHHH I get it I was wondering why some attacks pierced right through enemies
Viewing post in Critical Invasion jam comments
Yes, I should have conveyed that better in the UI, but beneath the player momentum bar there are icons for your combo attacks that have a number on them, which represents the number of additional combos you need to unleash the combo attack. They work on sequences of prime numbers so your first attack will go every 2nd combo, the next you add every 3rd, the next every 5th, and so on.