Anyone having issues with this game clearly just has 0 sense of rhythm. I was able to get the Impossible badge on a 2+ year old computer, any "lag" you're getting is your brain not being able to time keystrokes with the beat of a song.
Arrow keys + mouse... bad idea. Way too much back and forth, and the last few rooms are so dark that I had to use a walkthrough to beat it. 2/5 only because it was a decent idea, just had terrible execution.
Wow... this game might just have the absolute worst controls ever. Arrow keys and mouse? OK, whatever. But I have to hit the spacebar to use a potion? Or tab for a bomb? Alright, so I guess I'll just stand COMPLETELY STILL while I use any of my other abilities, and just let my enemies completely surround me. Good thing I used that heal... oh, wait, I'm dead. Awesome. 1/5 purely because they don't let us rate 0.
I really hate it when the difference between getting a badge and not getting it is one level that makes the entire rest of the game seem like a cakewalk. I'm all for difficulty in my games, but come on!
+1 If you agree that F-Zer0 is the hardest song in the game. I had no problems with Run N Gun or Switch v. Evil Dog, but can't perfect F-Zer0... what gives?