The late-game nerf made the game playable.
Tips:
Categorise enemies into: One-shot, Fight, Run
One-shot: Enemy can be killed in one hit (Your ATK greater or equal to Enemy HP + Def). Enemy attack does not matter since they will not hit you back.
Fight: Enemy can be killed without much HP loss (Enemy ATK less than, equal, or only slightly higher than Your DEF). Keep Enemy HP into account.
Run: Enemy not worth killing (Enemy ATK much higher than Your DEF or Enemy DEF higher than Your ATK). You will see more as you climb higher.
Take it slow where you can.
Kill as many enemies as you feasibly can for points and stats.
Try to collect all stats on a level.
Run around and kite enemies to give yourself more time to do math.
Running to the next floor early is better than dying.
Good luck to all tower climbers!
Thanks for all the fun games Adrien.
Keep making them, I always enjoy playing them! :D