Vedran,

Thanks for writing.  I am glad you liked the trailer, and I hope you like the game.  Immune Attack 2.0 is in development now….  many improvements and exciting additions are coming!

I welcome contributions!  But the code for the engine is not ours to open.   Viscious Engine is our engine.  It works great, makes the game fun to play….  so we want to keep it.  We tried open source engines, but we had no success with them.

It is something we discuss.  We encourage students/anyone to submit their game ideas, or even 2D mini-game levels.  We will post them!

Sincerely,

Melanie