Update v1.0.87

Changelog:

- Option to select main menu background now possible after completing tutorial (previously only after finishing the game); backgrounds are obtained by finishing a stage
- Option to select main menu background moved from options to landing screen of main menu
- Fixed a bug where the final background didn't appear automatically after finishing the game
- Interlude can now be skipped if it had been completed previously
- Fixed player drifting away when in some dialogue and level is being skipped
- Fixed jagged text in talking bubbles in some situations
- Fixed incorrect rendering of overlapping platform rails
- Fixed player pushing box too fast when on moving platform moving in the same direction
- Picking up a collectible resets the timer for "Feeling stuck?" hint
- Cutscene 7 - Fixed missing collision in one ground tile
- Epilogue - Fixed level boundaries
- Level 3 bottom left area, a blue platform on the right is switched and moved
- Level 16 bottom left area adjusted so box can't get stuck
- Level 16 ground under orange key edited so it is not obtainable from below with box
- Level 23 top left area adjusted so box can't get stuck
- Level 24 purple wall area lowermost wall shortened and lever moved
- Level 28 area near red pressure pad adjusted so box can't get stuck
- Level 28 final part - adjusted width of the wall near purple platform