Minimal fixes and additions

I wanted to add a couple of fixes and minor additions to this little project now that the jam is over - here's a change log:

-Teleporting to a castle refocuses camera
-Fixed audio sliders not being quiet when moved to 0
-Power counter added on neuro too (like on enemies)
-Added options button
-Improved edge scrolling
-Trail effect for teleporting back to base on death
-Trail effect for teleporting from castle to castle
-WASD on the floor as "tutorial"

I've considered doing a bigger update with more content, references, additions and polishing, as well as some of the suggestions I've gotten from the kind commentators and jammers - but still not sure if or when it'll happen. 

Regardless, thank you for checking out this change log!

Also, if you're following me, I might post a weird and interesting new project some time from now, hopefully...! stay tuned (: