Hi, thanks! New attacks are definitely going to be one of the things that the next version will include.
I've been already asked about putting some game modifiers(like indeed speed settings, or even hp or damage modifiers), which I think I can do, though I'm still not entirely sure about the speed modifier, as that might just make some attacks a bit impossible as there wouldn't be enough time to react probably, but we'll see, I'll try to make some tests, maybe something like 1.5 times the game speed could still be doable.