Looks like you can buy both of these on Amazon. Here are the links:
Incedentally I've been having a look at this game. It almost resembles Turrican. It's the fantastic Metroid Fusion:
This has to be one of the best games I've seen for the GBA so far. It's outstanding. I'll definitely be purchasing this when I get my GBA SP.
Damn. I found this piece of news on Pocket IGN:
It looks like Crawfish were also developing coversions of some Bitmap Brothers classics:
The Chaos Engine
I really hope these projects get picked up by another developer.