Hello Paperknave,
Really sorry to hear this is happening to you :( I sounds like the game applied some sort of setting right before crashing, and now it can't load again. If you could please send us your log and save file, we could have a look at it. If we're lucky, we might be able to hotfix so you can keep playing, or at least find what we need to patch for it to stop happening.
Save and log files located at: C:\Users\username\AppData\LocalLow\Valiant Game Studio\PendulaSwing\
Please send us both the file called Save.txt and the one called Player.log, in addition to any information about the issue you can think of.
Please include which version you're playing. The version number can be found in the main menu, to the lower left.
Email to hello [at] valiant.se.
Thank you!