Fix bugs for post-jam build

Here's the list of known bugs that are going to be addressed as part of this ticket:

[ ] Music does not loop.
[ ] “Catalyst” is spelled wrong multiple times.
[ ] Shrink Catalyst in final level has low chance of spawning out of reach if you’re VERY unlucky.
[ ] Platforming can be very tricky due to lack of quality of life features like coyote time.
[ ] Shrink Catalyst projectile does not spawn from the centre of the player in final level.
[ ] If you activated the Potion Machine from inside of it’s hitbox, you have to leave it and re-enter it to be able to use it.
[ ] Some enemies are unavoidable in the final level and have to be tanked.
- This could be solved by adding some form of lower-powered combat ability before you obtain the Shrink Catalyst - maybe you can throw an empty bottle that causes the enemies to retreat briefly? (this one would significantly change the way that the game is played, so I think it's a maybe solution. Probably worth considering other fixes for this problem)

Once these are all addressed, I can post the fixed post-jam version to itch (and ldjam.com) as part of #24

conor-wilson / drshrink