The game was running on Samsung Galaxy Trend 2.
On other smaptphones and emulator it seems running properly without glitches.
Sprites import settings are following:
Could someone explain why this happens?
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99.99% of the time "Generate Mip Map" is the culprit behind such problems. Please switch of this option for all sprite import setting. This option is only needed for 3D objects where the engine can scale down the texture according to the z distance for performance optimization.
You can read more about Mip Maps in this link - https://en.wikipedia.org/wiki/Mipmap