From internet: "Tactile switches have an expected lifetime of >100,000 operations.... Micro-switches tend to last longer ... The data sheet reckons a life of >1000,000 operations ..." so if you have microswitch in your mouse, you should get 250k achievement at least 4 times before it breaks if it's new.
And i have a slow notebook, if this thing lags try to turn off all instant messengers and resident things like running antivirus test. I've noticed that this lags less in fedora linux than in windows xp
the main character reminds me a bit graphics style from DOS game named Fox :) Anyway the best way to crawl is to first press M for mute, crawl for a while and press M after standing up.
this is great game, but no one likes unbeatable games, i think this game would have something like 4.5 stars in rating if it had only first 3 difficulties