alpha 3.2:

A shiny new UI, rebalanced mechanics, more diverse Danmaku mode, 16 new Lightning abilities and plenty of game design fixes.

alpha 3.3:

Laning. The speed of the particles depends not only on the type of ability (Bolt or Melee) but also on the distance between units. One unit of each team stands in the front, the others stand behind him.

Swap. You can switch positions with one of your teammates. If he/she agrees to, you'll be stunned during your next turns.

alpha 3.4:

Duels. You can fight against your friend. To send a request, you should specify his/her nickname.

alpha 3.5:

Bugfixes and improvements.
 

--At this point, it is time to search for an artist.

alpha 4.0 (Variance Update):

Ability levels. Abilities can now be leveled up to increase the values of their parameters.

Stuns, Shields, Passive abilities. Defense and Instinct (define the vulnerability to the attacks of each element).

Deterrent patterns (see this case for the detailed description).

Fire and Terra classes. The players now choose their basic class before starting the game.

Lighting class now has all the 28 abilities.

Ability draft (see this case for the detailed explanation).
 

--At this point, it is time to start promoting the game.

alpha 5.0 (Variance Update 2):

Soul abilities and Soul debuffs. Affect the movement of the player's soul (the thing that is controlled by the player in Bullet-Hell mode).

Summons (see this case for the detailed explanation).

Shadow, Poison, and Frost classes.

Enabling the abilities that were disabled because the corresponding mechanic (Summons, Soul abilities, etc.) wasn't implemented yet.

alpha 6.0 (RPG Update):

Items (increase your stats).

Gold (used to buy items).

Shops (there you can buy items).

Inventory screen(there you can keep and equip your items).

After the successful battle, the players are rewarded with XP, gold, and some items.

Story campaign. World map.

Bots as allies (used in story campaign).

alpha 7.0 (Quality of Life Update):

Tutorial (as planned in this case).

Dialogue system. The responses to the story campaign.

In-battle chat.

More information in the ability's tooltip.

Reworking the interfaces.

More sounds and animations.

pre-beta:

Friend system.

Steamworks.

A way to change the controls.

Adapt for various screen resolutions.

Localization.

Additional settings. 

Optimization & Refactoring.

beta 1.0 (Teamplay Update):

Improving the matchmaking.

Parties and party matchmaking.

Lobbies (where you can customize the rules of the game).

beta 2.0 (Evolution Update):

Evolve (see this case).

Ultimates (you are allowed to have only one ultimate in your ability pool. Ultimate abilities can be evolved only after the three normal abilities had been evolved).

Key abilities (unlock the most powerful abilities for several turns. Controversial mechanic).

Aer, Necro, and Radio classes.

Bans in ability draft.

beta 3.0 (Clans Update):

Clan system.

Bosses (see this case).

Dungeons (see this case).

Profile screen.

beta 4.0 (Craft Update):

Trade system.

Aspects (special items that can be used to make your equipment more powerful).

Workshop (there you can work with aspects. Your skills depend on your class).

pre-release:

Spectator mode.

Discord Rich Presence.

Fixes and optimization.

release 1.0:

Mortum, Cosmic, and Vita classes and their corresponding zones (you can read about zones for Tier-3 classes in this case).

The lost pages (see this case).

Silver and golden dust (used to improve the cosmetic qualities of the items).

after that:

Further cosmetization of the items.

Balance patches.

New items.

New bosses.

Events.