KeeperRL Alpha23 is not ready yet, but a lot of new features are already implemented, and you can test them out! Opt-into the testing branch through the game's properties in the Steam client (choose the "BETAS" tab). Only Windows builds are available for now. Below is a list of all major changes. You can read discussion on the changes here and here. I'm awaiting your comments and criticism :-). Please post in this thread or in the comments below.

• Removed mana regeneration in the library. Mana can only be gained by conquering villages or torturing prisoners.
• Statues and throne cost mana.
• Demon shrines cost gold, portal costs stone, eyeball costs wood.
• Imps, legendary minions and potions cost gold.
• "Full control" mode, with direct control over each minion on the team.
• Removed strength, dexterity and accuracy attributes. Attacks never miss.
• Added spell and ranged damage attributes.
• Added spell training in the library.
• Vampire lord is hostile when released from his coffin.
• Removed arrow items, bows have unlimited ammo.
• Reduced damage dealt in combat by 50% (combat is slower).
• Made combat less random.
• Added health bars.
• Added "heal other" spell.
• Removed first-aid kits, except for adventurers.
• Added personalized training limits for minions.
• Mana is rewarded only once per enemy kind.
• Creatures no longer become hostile when accidentally attacked by members of the same tribe. (But still do for different tribes)
• Added resistances and vulnerabilities to all damage types.
• Made all villains visible in the "villains" tab. Useful for pillaging.
• Attributes don't decrease when creature is wounded.
• Made giant spider's webs invisible, giant spider is much more dangerous.
• Dragons cast spells.
• Common field of view between all minions.
• Made Vultures much less common.
• AI doesn't panic as quickly when wounded.
• Tree stumps can be removed with the "remove construction" order.
• Added library room upgrades necessary for higher training levels.
• Creatures learn spells at specific training levels. (see Keeperopedia).
• Added magic missile spell, which uses creatures's spell damage value for attack.
• Only imps can whip and execute.
• Added gallows installation for executions.
• Minions will only go to sleep if they haven't slept for 1000 turns or more.
• Improved "collapsed" state. Artifact war-hammers cause collapsing.
• Reworked "bleeding" state. Creatures no longer bleed when their health is low. Arftifact battle-axes cause bleeding.
• Poisoning and bleeding deplete health much more quickly.
• Crafting, geology I, and sorcery are unlocked by default.
• Morale affects imp speed, imps can be whipped.
• Removed backstabbing and minimum strength requirement for some weapons.
• Added nicer tooltips for creatures.
• Added nicer map window.
• Added animations for some spells.