Something that I think would make the gameplay flow a bit better is if there were 2 buttons used to swap between characters rather than having to cycle through them. The robots are taking my heart pick ups!
I was sticking with the basic control scheme of the Lost Vikings, but if I do an upgrade later, I'll include other control schemes so that players can more easily switch between characters.
Also, I need to check on that heart pickup thing, because that sounds like a bug I missed!