Glad to hear you liked the game! Even the secret first one!
Full blown animations for the enemies are coming soon, on release, so your issues with them should be mitigated. Stay tuned!
There's a good strategy to get used to the bosses' attacks: Start by just blocking them, so you can get the timing down. Then, move on to parries just as they're about to hit you (the entire blocking animation works as a parry window). Finally, start using dodges (which cancel any other animation, including attacks) to avoid their retaliation while counter attacking.
There's already a save system in place, just exit the game (without dying) and you should be able to continue from the main menu. Next patch, in two weeks, will also feature separate save files for each mode. Also coming in this patch are two new weapons, almost twice as many powers for rings and boss stones, twice as many spells, and much more!
I'm considering a dungeon creator mode sometime in the future too. Who knows?