Thank you very much for testing and sending your feedback!
I haven’t been able to reproduce this bug using either WinAPE or Ace-DL, but there are lots of factors that could be at play. In particular, if you’re using rather specific (virtual) extensions: I’m not sure the game is fully compatible with all of them...
I tested again, and it works both on AceDL and a real CPC. Don't know what happened. Anyway, I'm at level 9, and it's great fun!! So clever. The catapult is awesome. It reminds me a bit of Incredible Machine, where you could have many ways of solving the problem, sometimes with sheer luck :).
I see my name in the thanks, did you use Arkos Tracker?