Lowered the required number of defeated girls to move to the next floor (was 35, now 15). I realized that I was asking too much of the player and that defeating 35 girls is just boring. So I decided to lower the required amount to open the next floor!

Lots of math fixes. I'm still trying to make a good balance for the game and I'm looking for the most suitable formula. I hope it feels better now.
Added Level 2 Slimes
Added a second scene with slimes
Added Level 1 Ghosts
Added the first ghost scene
GUI changes The upgrade buttons now display the current attribute level.
In the settings menu, the mute\enable all sound in the game buttons are added, and the sound now saves the settings after exiting the game.