I increased the breach limit from 48 to 64 (based on your screenshot) .
The more it's increased, the more memory it consumes, so it must be done gradually.
The medusa should be fine too now, please try again (I've just uploaded the updated ISO).
Ok, the 'asset ZZ6' code on your screenshot means that a map asset wasn't fitting in memory (due to fragmentation). The course of action was unload all asset bundles between stages, according to the guide and advice on the engine's Discord.
I gave it a shot, please try again (updated ISO). At the moment, I unloaded the assets between levels 5 and 6, because it's where the memory is getting fragmented to the point that the asset isn't loading. But I will ask there if it's recommended to do that between all the levels, which I'll do if the problems persists. Thanks again.