Really? Thanks! I'm really looking forward to seeing it.
The adjustment of the footsteps FX is already planned. It may take a long time though. I've received a lot of good suggestions, and after addressing them all, I'll release the next version along with the second level.
For cheat codes, they need to be converted to the actual game function keys (WWSSADAD JUMP SHOOT).
The Easter egg is a signature action of Contra, but it's "odd" in a third-person shooter:)