Man, the production quality on this is excellent, I was not expecting fully voiced cut scenes! It looks great, the lighting effects are simple but add a lot to it.
I played the web build and didn't encounter any technical issues. A little bit of Coyote time would have been nice, or maybe I'm just terrible at timing my jumps :D
Switching between shooting robots and sucking up zombies was satisfying, and after playing for a bit I got into a really nice flow. My only complaint is that the level felt a bit small after running around for a few minutes, especially with zombies and robots spawning in directly above you pretty much as soon as you've killed some.