Thanks for the feedback to all. I agree that this doesn't bring too much new to the genre. This was actually my first flash game and probably I rushed too much on releasing it. New development for this has stopped and next (more unique) version is on the design table ;).
Altheman, fatalanth, T9XSPAZ: I agree about lack of features. I think I'll try to add some new stuff soon to next version. At least I have quite nice ideas of different kind a plants in my head.