LÖVE

This site is nice for summaries of the difference licenses: http://tldrlegal.com/

GPL is actually a fairly restrictive license.

There is some nice tips you gave me. Thank you. So I edited the first post and reuploaded modified .love file which now includes license.txt.

From now on I'll be more careful on submitting demos without license

Made some changes in the demo. It now somehow simulates objets impacts that makes them to merge in one bigger and heavier body. Try out
Merging bodies now share their masses and volumes. Ther speeds are also now calculated with impulse conservation law. But main body will now eventually eat up all the others