Hello! Sorry for the inconvenience! I will make sure to resolve this issue in a future update, very sorry for the oversight :)
Save files appear to be here:
Users\<username>\AppData\Roaming\Stencyl\437 Underworld EP
If you delete both the files in there, you should be up and running again!
Thanks a lot!
Although I was searching like crazy for a while (since the whole appdata/romaning/etc. branch was hidden and I didn't realize it), I finally managed to find it. Deleted the 2 files there and now it works again! You can't believe how happy I am right now! :-)
PS: I don't blame you for it.
It was rather me being stupid there. ;-)
No problem! UI design oversight :) Glad that you're enjoying this! I'm in two minds about whether to expand on this version as there's loads more I'd like to add, or carry on with my intention of moving over to Unity so I can do nicer lighting and VFX and things. Either way, let me know what things you're missing after some playtime!