Thanks for the suggestions. Actually, I did play your game (rated it highly, but forgot to comment). While playing I was thinking "damn, we should have added a run button!"
Let me guess, you thought that in the survival mini-game?
I mean, added a button to our own game. I thought your was pretty much perfect in terms of speed.
AA, the character already moves fast. And if you walk diagonally, the speed will be slightly higher than usual, lol.