If you want it to be a simpler alternative to fighting games you should definitely explain what's going on, because as a long time fighting game player I have 0 idea how to improve, so I lost interest after 3 matches.
The guard break(?) happens at times I wouldn't expect, blocking a jab and then attacking is apparently still unsafe, there seems to be a parry mechanic that didn't give me much of an opening either, and like everyone else pointed out the AI is insanely aggressive. The game really needs either a tutorial or way more feedback on when it's advantageous to perform which action.