I managed to clear stage without killing a single enemy unit, but lost 1 of mine, so i got -1% battle bonus, which is more like battle penalty.
So i wonder if it's intended that it can go below 0 or just mistake
Finally unlocked the 4th slot in Factory.
So far still no luck with a 5* being build, but got two new 4* TD, both very pretty as far as the design and art style go. Though I dont see much use in them due to each costing 5' while the ones I use are fairly solid and cost only 4'.
On a brighter note, my sexi Kitty Cat Tabby, brought me a 5* Emblem from her scouting. Its an offensive one, but didnt have to look at its stat yet.
Use heavy tanks to scout with half decent atk (100ish is enough) and as much defense as you can get, they will often be able to scout for 12+ hours and net you 4 emblems each, still a long grind to get those tasty 4-5*s but at least it's something. Getting 5 HTs geared enough takes a while as well but at least by now you should have all 5 scouting slots open easy.
Flower Knight Girl: 255445855
Ya gotta close AB when not in use and hopefully come back in time for your scouts otherwise the game will lag, stutter and memory leak causing you to fail your runs badly as commander skills will always miss the mark. Deploying units will also not respond without multiple drag and clicks.