I think the problem with the end fight of Ego Draconis was that only very specialized builds (for example, a pure warrior pumping everything in strength, vitality and skills that regain health actively or passively could easily survive - even standing in the middle of the room just hacking away), while maybe most players would spread out skills during the game making survival harder.
Building an effective generalist is possible, though it does increase the difficulty in the early game. I posted the stats
over here.
A rebalance to make higher level enemies less insanely difficult and lower levels be able to harm you would be good. It might be nice to have a good mixture of of enemy levels so there are clear 'leaders' and 'fodder/minions' when fighting groups of enemies, if the rebalance is done well.