I do not like them. I do not like them at all. They're quick, frustrating, take a decent chunk of health, and always seem to show up in groups and at the worst time.
But I finally got some sprites together for them none of the death sprites, but that's neither here nor there.
And now I love them.
I mean, I still hate them. One literally killed me in my last playtest. But now I love them. They're little yellow hornets and they fit in the game now and they fly and they're great.
So yeah. Expect them.