Nice idea! :D

 Makes me really afraid to lose 

hahahahah, thats an awesome idea.

"Next Sinners" made me laugh.

corrected
 

And I wouldn't like to do them bigger.

First of all thanks!
1) It agree, it has turned out not so convincingly.
2) Figures too small, I couldn't represent well a reflected light color.

Well done! The idea is very cool and the general look is awesome. Some suggestions for improvement:

1) The border between black and orange in the "flames" doesn't look right to me. I'm not sure if that's supposed to be flames, or smoke or some other background.

2) The tetris pieces are all highlighted with a light source above. Surely, the falling piece should have a light source below (i.e. the flames in hell below) and the burning pieces would probably also be brighter underneath, as burning embers.