Your bad design decisions have made me quit the game.
This week I managed to make it to Tower level 1. Now I see that Colosseum difficulty is scaled with tower level. This means that even the easiest chests in the Colosseum can combo for 60k+ on turn 2 if you face a synergistic comp. I BARELY managed to make scrape my way into tower 1 to unlock the girls that are gatekept behind it, and now the difficult chests are impossible for me because the enemies have 60k+ HP. So I am punished for pushing further and progressing, and now I can't do as well in events as I used to be able to.
You make very bad design decisions; I quit. I'm not even going to finish the event. This is just stupid.