Finally! I died at level 122 to a plus boss. The game is absolutely beautifull! I played it way too long. The main struggle was how not to die to plus bosses and how to not add more useless new cards to your deck (Because you can't skip upgrade screen). Minus bonus that squares number is OP. No need to even consider multiplying if you have that. Plus bonuses are way weaker. It requires good base values on cards. Also intresting that you can try to prep some cards with +2 or -5 bonuses, for other bonuses that multiplies odd, even or prime numbers. Great job!