Thank you for giving me your suggestions and thoughts, Peter!
I've heard that the difficulty curve, the collision problem with the player, the slow speed of the sword are a few problems of the game from the other comments and I've noted it down. And yes, this game lacks a bit of indication, your suggestion on giving an indication of when a mage will throw a potion and a buildup animation is very cool and I've noted that down too :D
Thank you for your compliments and yes, I will be updating it like I said and expect all those suggestion arrive into the actual game :)