Why won't my phone open up?

Q. I have a samsung galaxy y s5360

the thing is, i was just playing some games, passing time when it started acting up on me, specifically, the graphics got a little glitched so i panicked and pressed the button on the center which closes every open application and into home screen but then it was still hanging up so I turned the power off attempting to reboot but now it's stuck on start-up with the whole "samsung" display. i'm really freaking out.

has anyone experienced this?
or
does anyone know a trick to probably fix this somehow?

just in case this matters, the game i was playing was "flow" i think that was what its called.

thanks in advance

A. Dude sucks for you.. I dont wanna sound like a douche bag that came here to get points or anything (I dont come on Y!Answers often anyways) but I dont have any experiences like this though I would ask you to remove the battery for like five minutes and then put it back in and try to start it up, if this didnt work then you should go to the nearest phone fixing place and ask them to fix it for you !! Good luck