The controls were not slow, and the attacks were perfect.
The game was not very hard (for me), the only part i died a few times, was the one with many jumps in a row.
The people before me probably played the game by clicking "play this game" instead of "popup" wich causes major lag , and therefore their complaints...
This has been an issue in a lot of games(causing stupid bad reviews), and I really think the staff should do something about it, at least a warn next to the button.
The game really felt great, the music fitted brilliantly, and I loved the difficulty, great job dudes. AWESOME sidescroller.