thank you for the reply, but since I earlier said, I would like to avoid blending, since I will make a lot of holes in one sprite. If I use blending effects I would have to use for each hole new sprite. I would like to avoid that. I tried Canvas plug-in to draw "holes" on canvas, with blending effect to make the holes in the sprite under it. but the catch is, that canvas doesnt have abillity to use blending effects :/ I tried to apply blend effect on whole layer where canvas are, but no luck.
So question remains the same, is there a way to alter alpha of a sprite in-game?