Describe your problem a bit more.
Is it running partially or not running at all?

 

That is not a problem with NFS Shift, many S5830i users have reported white screens in a lot of apps. Games usually, they can hear the music, use the controls but the screen remains white.
Are you getting this in any other app also?

 

Don't compare your phone S5830i to S5830, they are very different phones, the entire S5830i hardware is different, its more like Galaxy Y than the original ACE.
The S5830c/m/t/l models are still similar to original S5830 but the 'i' version is very different.

 

you might be trying to play HD games on ACE... which might be the problem. ACE only supports HVGA resolution.

 

NFS Shift is compatible with ACE, its not HD, can't say about S5830i.

That model doesn't have a dedicated gpu like the original ace, the cpu itself is modified to do graphical calculations, that's why its too difficult to make android 4 run on this model, the hardware is too weak for it.
Those samsung guys increased the cpu speed, but actually what they did was to remove the gpu and made the cpu to accomodate its functions, so in reality that increased cpu speed they gave s5830i does not actually improve performance at all.

 

S5830i has a weaker graphics unit than the normal Ace. Actually the cpu does most of the graphical calculations and it has no seperate gpu chip. So Shift doesnt work.

 

hie am using galaxy ace GT-S5830 and i'v downloaded nfs shift v1.0.83 with extra 100 mb data and when i run it it opens with an awesome image of EA games den a dialog box appers saying se3 missing device phone number n wen i press continue music starts and a black screen appears saying wear helmet while driving cars n.all n den it dissappears n i get a black screen n suddenly it closes n takes me to home screen.plz sort this out..