Oh no! I'm sorry! Thanks for reporting this. If it's not too much trouble, can you send me some information about your browser and what kind of computer/mac you're playing on? (Like, what model is it) I have a contact form on my website: https://www.redowlgames.nl/contact/ (the e-mailaddress is optional)(I'm a bit wary about dropping e-mail addresses out in the open)
Also, if you send the lion/turtle/owl levels you had when the game crashed, I can reset the game to that point for you. If you want.
We're going to look into what caused this issue and I'll post an update when we've found it.