Hey! I used to have the Red Ring Laser as my lowest-AP unit. Then boss-type ones. With benimaru buff, you need low-AP unit(s) to counter. If you don't know which one, get benimaru then. The meta game changed for the better. Now most boss units take a while to build up so a winning deck is more balanced now. My tips to get stars and money so you can upgrade to level 40 fast. Money: Go to third map, last special map (red), stage 5 and click on raid. Having 690 sortie points, you can make a bunch of money fast. In one minute you can make 800k. You can pay 30 medals to recharge sortie if you want. Stars: Go to the last stage on event (5-4) with Red Allen, Keesi (hi-do bombs don't attack it) and a bunch of 80-90AP units. Use the weak units non stop. Build the Keesi ASAP and Red Allen when the enemy army get closer to your base. If necessary, use the Keesi special. The hi-do bombs don't attack your base, so when your units are near the base they stay alive. I put a Big John when the enemies are getting closer. If you manage to put it there, it won't get attacked by the bombs. When I reach AP MAX and have enough units, I fast forward and put on AUTO. Each time I make around 50k stars. Play twice and you can buy one level 40 upgrade from the store.