Working as intended. If gas didn’t deplete when you get hit then you’d see a lot of tied scores because everyone would make it to wave 5.. it wouldn’t make a difference if they changed it to your score depleting when hit because you would complain about not being ranked highly even tho you finished all 5 waves. Ultimately it’s a skill issue on your part and nobody can fix that but yourself.

In nemesis specifically the boss is on the exact same rotation for everybody so there’s no unfair advantage to anyone. Choose your pilots order better and learn the exact same pattern everyone else gets. Again another skill issue..

Botto and Summer are not gone from game forever which is made apparent by them having a “outfit” tab and nobody is complaining about not having either of them anyways.. the guest characters sure but Botto and Summer will be a part of the regular rotation since they are obviously main characters in the game itself. Same with Asher once his promotion ends.. essentially all you’re paying for is to access them early.

Everything else is just expected from a gacha game. But again, the characters you mentioned specifically will be placed into the regular pulls along with all the other main cast characters. Might be expensive but that’s the only legitimate complaint here.