I don't think a multicart game can be combined into a single p8.png, but you may need to check with other folks that do setup for their handhelds to get that confirmed - it's not something I've tried to do in the past, my projects besides Astra have all been single-cart. If you drop all the p8s into a single folder they should recognize each other when run to load between them and for save data, but I don't know whether that works with some/all handheld devices' systems.
Viewing post in Astra And The New Constellation comments
Hi again - that worked great! The game is really good so far - I'm just starting level 6. Some very challenging sections, and I'm hoping I can get through if the game ramps up much more. But the movement is very precise and fun, and the controls have just enough to them to allow for some finesse. I can totally see the speed-running potential. It's really excellent stuff. In terms of 'feel' I'd put it alongside excellent games like Mos Speedrun, and I think we can even mention the original Super Mario. The games I've been enjoying most this month are Metroid Prime Remastered and Pac Man Championship Edition for the NES. Now this sits with them. And it looks lovely too. Played on a Miyoo Mini.