Just tested.
This project could be fun if you will speedup everything twince. Mana regen is too low, damage is too low, movement is too slow, boss windups are too long, attacks take too much time (we have to wait for a long time outside attack range area).
I like that the bosses have different abilities, but over all everything is too slow and this makes game too easy. Personally I only take a damage, when I get bored of waiting for a window.