Congratulations on finishing the game.
I think the graphics sells the kind of creepy atmosphere that I think the game intends to give. However, just a tip for next time, try keeping the pixels the same size throughout the whole game. I think the pixels for the keys are way bigger than the pixels for the character and environment.
A little bit curious but how exactly does your game fit the theme? I was kind of hoping I could find some information in the description but unfortunately it seems the description is in Russian or something... I unfortunately couldn't finish the game so maybe I missed how this game fits the theme.
Also... it seems... this game has neither sound nor music? I think you shouldn't leave this next time -- at least add some quick sounds. And the movement is a little bit too slow and slippery -- is there a reason why you made the character continue moving when moving midair? (^_^;