Shop mechanic and Look has Changed

Shop has been changed from a normal PNG texture to my beloved Panel

The system behind shop also changed.
Before shop was created everytime the button was pressed, Now the shop is always there but it just isnt visible. That should help with performance a bit (not like anyone had problems with that with game this small)...
Next update will most likely be new Enemies and expansion on waves, and after that i plan on starting creating Meta Progress (Upgrades outside of levels)