Guns, achievements and saving progress!

Not a lot of new content for this update, mostly QOL options and bug fixes.

Saving is done automatically and it's now possible to go back to any stage already visited (items are conserved)

Guns are a new weapon that can replace the bow.

There are now 4 achievements per stage, only 1 is not feasible for the moment (the "defeat Aqua" one)

That's all for now!