I'm playing Space Froggy 2 by Gary Scott, a game made with Sprites Alive. I've found 7 out of the 9 ROMs but am now completely stuck!

I can see that there are a few areas of the map that I haven't visited yet but I have no idea how to get to them.
A help screen says that there should be keys and doors in both blue and red colours. However, I've only managed to find red versions of each. This suggests that the game is perhaps incomplete.
Has anyone actually managed to collect all 9 ROMs and finished the game? Any help would be greatly appreciated.