Thanks for the video. Sorry you had so much trouble with the controls (I tried to explain them on all the signs near the starting point). Here's the main things:
- During combat you use the SPACEBAR to time hits and deal bonus damage / block more damage (this is when you see the shrinking circle!).
- To target skills (like Heart Action Blast) you need to use the MOUSE.
I'll hopefully have a tutorial ready in my next prototype.