Thanks for that demo version, that's awesome! Now we can watch the intended solutions for all the original levels! EDIT: I just noticed that the demo for level 99 doesn't solve the level...but it gets close.
All the level and graphics files use a different compression format, most likely Master Cruncher 3.0. You can get an Amiga executable for it here:
http://www.amiga-stuff.com/crunchers-download.htmlI've got it to run in WinUAE, but I haven't managed to decompress files with it.
Perhaps someone else is better at this... Would be interesting to see if there were some differences in the art tiles used, but there's also some other way this can be found out. The executables are also compressed, seems to be RNC ProPack which is used for levels/themes in the final version; the doc of it also lists a mode for (de)compressing executables, trying that mode gives me a notice that the program doesn't recognize the commandline parameter.
Anyway, the good thing is that Pushover also recognizes and operates with uncompressed files! The level format is only different in the way that in the demo version the hint text in French/German/Spanish is missing, so if you remove it the level is compatible with the demo version and its demo can be played! The missing style files are no problem either as simply adding the uncompressed ones from the final version solves the problem.
Now if only we'd know how to record demos!
While figuring this stuff I only had time to have a short glance at your levels, but they don't seem simple either. Only solved the first one for now. You've already solved all of mine I understand?
I now see the difference between the two ANT(E) exe files. The normal one adds shading to the level, from light on the top left gradually to a darker shade at the bottom right.
And I realized that the sourceforge remake does support the Cavern style. It just doesn't have levels using it. I'm wondering, it seems that this remake is based on the disassembly and the original files, which would be good. I just feel it needs some polishing.