I loved how this game can be addictive, and that you can make meaningful progress as you learn the time between pressing a particular key on the keyboard, and what to press on the next one. At first, I gave up on this game because I thought it was too hard and unpredictable to get anywhere, but I tried again a few days ago, and eventually I got all the medals.
However, I do wish the lag wasn't so prevalent in this game. A bunch of times, it felt that the character was non-responsive when I pressed a key. It may be because the nearby enemy was too close, but I still think that can be improved upon.