It would be nice if there was "special missions", something like a mission every couple levels that would have higher grade enemies, but also higher chance of quality items, and after done it would be locked for several days. It also could drop special components or so that wouldnt be found elsewhere and allowed building of certain higher level buildings or traps. These missions would have their unique designs and could be part of the story that you guys are developing.
I also dislike the fact that I can do missions only 2 levels above mine, as I would love to try a 3, maybe 4 levels higher then mine.
Finally, I would love to press ctrl or so to select all of the wooden spoons when using the recycler. Yes, I do want to recycle all of them. I dont need to save a spoon.