Thanks for playing Maki, I hope you didn't die tooo much! When you move forward while standing or crouching you perform a dash attack based on that stance, the problem here is I think that the hitbox object is being destroyed a little bit before the dashing attack ends, as a result of that you get these rare instances where the invincibility frames are ending too early and making you take damage. I've been told there are instances where it happens with the normal attacks too so I'll need to look into it.
Also, I apologise for the short length, I had a very tough time creating everything by myself so in the end I decided to try and prioritise quality over quantity, the good news is that making more levels will be a lot easier now that the core mechanics and systems are in place!