v1.5.2 Welcome, Piotr & Olga!

So finally, I decided to give names to game characters and also introduce a second one.

Please welcome - Piotr & Olga!

Piotr is the basic game character that has been here from the very beginning.

Olga is a new playable character.

She's a bit faster than Piotr, but has a little less HP.

That's all the differentiation happening for now, but we'll see what the future brings :)

Remaining changes include:

- adding a snowman :)

- adding randomly generated snowfall

- there's now kill count in the top right corner

- health bar is now red

- fixing bug with "invisible" ammo (if you haven't found it so far - too bad, it's gone now;)

- adjusting position of mobile hamburger menu