Although basic design, the game keeps you "on your toes"...or fingers, in this case. On a personal note, I love the fact that the "old school" game look and feel still is enjoyable. Props.
For those having trouble, be aware that it's sometimes necessary to reset your skills to assist in passing some things...that's how I got past the first epic boss.
This game is very good for hand/eye coordination. Using the mouse is much easier than using the keyboard. This game needs more levels and needs to remove the slightly annoying, yet more challenging "pulsating light" effect.