Rudolf, have you designed a sequel yet?
Multiplayer, editor, proper custom user level/campaign system, and modding additions are all on the list!
Yeah, all the ideas and mechanics that did not make it into the original game. :-D
There were some wacky ones too, like, on taking down an enemy tree the game view would switch to the inside of an asteroid, which consisted of a WHOLE NEW GENERATED LEVEL, where the player would play a game similar to tower defense.
We also talked about the level select screen actually being a galaxy, and clusters of space would get into reach of each other just like asteroids offer a sphere of influence in the levels. So in that case the level progress would be completely non linear.
We also talked about modifiable seedlings, and that players could launch a mother tree into new areas of space, with the seedlings they had modified already, into tough new areas.
Then there was the idea to allow the player to keep on playing after conquering a full level, but rather than conflict based it would be a number of mechanics that mean they could create new seedlings/trees/flower types by recombining and splicing. Evolutionary gardening really.
I can go on for a few pages with other ideas I had?