FOSS gamedev and creative worlds

This is just Jeija's slimes mod, except with different textures. The only thing I changed (besides the textures) is I changed the code a little bit so the nyan cats would have a different texture for their back than there sides (plus I tried to make them drop rainbows when killed) . I can't get them to spawn so someone will need to find out how to do that. Also, I need help getting thm to drop rainbows when killed. This is my first mod (that I did any work on) so I'm sorry that so many things need to be fixed. It does not have any dependencies as far as i know but it might need mesecons.
Download:
http://ompldr.org/vaHRrYQ/Jeija-minetest-mod-slimes-ceafd00.zip

To upload a file create a zip folder for your mod and upload it to a file sharing site such as http://ompldr.org/

here:
http://ompldr.org/vaHRrYQ/Jeija-minetest-mod-slimes-ceafd00.zip

can someone help me make them drop rainbows when killed?

I'll help when I get on.

EDIT:
Done: http://ompldr.org/vaHR0aQ/nyan_cats.zip

Thanks! I was going to change all the places it said "slime" to "cat" but I wasn't sure if i needed to change anything else.