Hi,
I’m not sure what’s happening there - it shows as only needing to cost £5 on my end and I’ve managed to check out for one fine! It might be worth reaching out to itch support about it as I’m not sure what could be causing that issue.
That said, if you’re happy to pay via PayPal drop an email to Chris@loottheroom.uk and we can sort that out. I’ll be able to issue you with a download code and bypass itch until this issue is fixed!