This is due to a bug in the core's implementation of port 0xFE. I was suspicious that there was no Issue 2 / Issue 3 selector in the menu, and this has confirmed my fears.
If you go here:
https://worldofspectrum.org/faq/referen ... erence.htm and scroll down to where it says "Bit 6 of IN-Port 0xfe is the EAR input bit", there's a test program there. This core fails the test; the result is that you're in a Spectrum emulator.
The menu of Blinky's Scary School relies on the 0xF7FE port returning 0xBE, 0xBD, 0xBB or 0xB7 depending on the key pressed; however this core always returns 0xFE, 0xFD, 0xFB or 0xF7 for the corresponding keys (bit 6 stuck to 1).
Abu Simbel Profanation had a similar problem that rendered it unplayable with the keyboard in some machines/emulators. Indeed it is unplayable in this core too.
If you have the ADC module, you can try playing audio through the ADC input to see if you can select an option (that should force bit 6 of the port to flicker, returning the expected values sometimes). I don't know if the game will work after that.
Edit: Also, the ZX Next core gets this right, so you can use it instead.
