This game, for having such simple graphics (this is not a bad thing ofc), it is really poorly optimised. I can run smoothly Unity games with way better graphics and plenty of effects.
With that being said, the game is good so far, well written and a good gimmick to all these lovely classic RPGs. If you like Might & Magic Series, Wizardry etc, you will probably like this.
The only thing I miss here is the possibility to move (forward, backward, and turn left and right) with the keyboard, as well as navigating the whole interface with just the keyboard instead of Mouse+Keyboard.