Thanks for the tips, I never see other keyboard models so I never bother to add different control scheme. I'm going to consider what to do with that but for now hopefully player would read the note in controls.txt I've included with the game.
As for jump issue, thanks for the elaboration. That's what I need to know to understand better of the issue :)
When you mentioned about laser's color, I've checked my sources where I learn about the colors and .... I learned it wrong. The source didn't use saturated color like I did so it was my mistake. I'm going to reduce the saturation in my next projects. Thanks for reminding me about this :D.