Finally, these are the blocks that bring the FORTRESS zone to life:

By chance, I stumbled upon this again, and now I have a different answer. Further tests proved that saving didn't work if the location was in the first 64 kB of the image. The KFF author confirmed that it's a restriction imposed by the firmware. The update released about 11 days works around this issue and now saving works also on KFF.
A specific game of mine here on itch.io, out of the 19 projects that can be paid for, is being exploited for fraudulent purchases since June (27 times, until now).
Such purchases can be detected as they follow this scheme:
* the email address is <name><surname><number>@gmail.com (the first 11 times there were also dots separators);
* the payment is made by credit card via Stripe;
* the card holder name (sometimes with the address) is exposed on the invoice (unlike on the invoices of the regular purchases I've checked for comparison);
* the card holder name does not match the one in the email address;
* the card holder is from the US;
* the IP is from some other country;
* the payments is of $5 (the minimum amount);
* the game is not downloaded.
My guess is that some hacker stole the credit cards information and makes low-value purchases to get the card holders names and addresses for bigger frauds.
I have always duly reported these purchases to the itch.io support and 16 of them have been marked as fraud and refunded (it looks like support has still to process the last 11, with the oldest one dating back to 22 days ago).
However, these purchases are really annoying because:
* reporting them steals time;
* until they are processed, I can't request payouts;
* maybe they cost me payment processor fees (I've asked support, but I didn't receive an answer yet);
* some users reported that they couldn't but the game as they got an error, so I'm wondering if that was because of some filter that itch.io put in place to prevent the fraudulent purchases.
Did anyone experience the same and, if so, how did you deal with it?
First of all, thanks for your interest in BOH.
BOH is a 16-year old game: there are no plans for it.
No other ports will happen. Maintaining multiple versions is a costly undertaking, and the current versions are already too many (in fact, the Linux and MacOS versions have been retired). Time is better spent on creating new games.
The sources will not be made public, sorry.
Unfortunately there is not going to be an update for AmigaOS 4 (in the foreseeable future, at least) as my AmigaOne machine (the only AmigaOS 4 machine I have) suddenly stopped working and I just do not have time to try the emulation or cross-compiling route. That said, the fix is just really a matter of polish - the game is perfectly working and usable also without it.
As for the MacOS version, supporting multiple version is very demanding, so it was not an option.
From the tests I made, it really looks like the problem is not in the game, but in KFF (that's why I opened the issue of KFF's GitHub). Unfortunately, there hasn't been any reply yet, nor have I received any feedback from EF owners, so I still don't know for sure.
That said, if you send me an email from the same address you purchased the game from and tell me which zone you reached, I can send you a cartridge image which will allow you to start from there.
Thank you so much, your feedback is much appreciated!
The game saves to cartridge the index of the furthest zone reached, so, when the game is restarted, it is possible to select the zone to start from by pushing the joystick up/down in the menu.
Note: the feature requires an EasyFlash-compatible cartridge/device; on VICE it works perfectly, but on my Kung Fu Flash the feature suddely stopped working, so I opened this issue on GitHub. Could you tell me whether the feature works for you and which cartridge/device you use, please?
Thank you so much for the information and the compliments!
When I returned to the C64 quite some years ago, one of my objectives was to make colorful hires games, so I chose ECBM for the platform part of the first QUOD INIT EXIT (the sky, instead, is a hires bitmap). In this game, I "just" pushed things further ;)
By the way, I'm not a C64 historian, but I'm under the impression (and I stress that it's an impression, so I might well be wrong) that after the release of the first QUOD INIT EXIT the ECBM got more love than before by the C64 scene.