Nice job and it's very nice of you to share the source with us Looked into your soure code, I think if you can really make subclasses extend from their fathers, your program will become much clear and efficiency :P

"So u cant just hit "a" hit "d" then hit "a" again to blink left. " It just don't work~ No matter how rapidlly you change between "a" and "d" blink won't take place

it also happens in this situation: you hold "a" to move left, then you let "a" up but hit it down again in a very short time(less than 0.15 sec)