I thought I wouldn't like how the skulls shot at me but it grew on me and ended up being pretty fun. I assume you ran out of time for SFX but at least some sort of ambient looping sound or music would have been nice and likely would have made the lack of SFX not nearly as noticeable. The two enemy types worked well together design wise. I like the holy shot idea, but I feel it should have had a bigger hit box considering the constrictions.
It is really cool that I get the opportunityto kill multiple in one shot. The one downside with this I feel is that because I'm a one hit I'd rather not line up a triple shot because there's a decent chance I'll get hit while doing so. The triple shot feels cooler to do but if I get hit while trying to time it, it feels very punishing.
It was a fun experience. I think you did pretty well gameplay wise.