First off, let me say that the game was awesome. I’ve got all 90 gold stars, and I am looking forward to more content in the future.
The only thing that bugged me a little was towards the end of the game, buying new units was a bit of a pain, since they all start at level 1. Being able to purchase higher level recruits (lvl. 10? lvl. 15?) late in the game rather than have to grind your new ones would be a nice touch, I think.
Higher level recruits?
This is definitely a planned feature for an upcoming patch. In future versions, you’ll be able to pre-train units up by paying additional scrap. If we add this additional cost we might drop the base cost of hiring new units, too, or at least make the cost curve scale less aggressively.