This is the one level launch demo. I'm not sure how update it will be. Steam features have been disabled. So there are no achievements, leaderboards or cloud saves for this version.

Demo Features

10+ enemy types.
1 Giant boss fight.
Make your own challenge select your number of lives, continues.
6 difficulties from "power trip" to "nightmare."
Around 3 unique playable vessels with their own default weapon.
specials that wipe bullets and damage enemies.
Speed and big weapons. You have a wide screen to cover.
30+ weapons to find and a random weapon generator.
Weapon upgrades for any weapon, even the random ones.
Add a beam, remove a beam for extra power, add fire.
Charge shots for bigger enemies
Controller and Keyboard support for up to 4 players

Full Features

70+ enemy types.
Giant boss fights.
2 campaigns that adjust the position of each enemy.
Forever abyss that generates a campaign from 200 waves.
Daily campaigns that are the same campaign for everyone around the world for 24 hours.
Make your own challenge select your number of lives, continues.
6 difficulties from "power trip" to "nightmare."
Around 20 unique playable vessels with their own default weapon.
8 specials that wipe bullets and damage enemies.
Speed and big weapons. You have a wide screen to cover.
30+ weapons to find and a random weapon generator.
Weapon upgrades for any weapon, even the random ones.
Add a beam, remove a beam for extra power, add fire.
Charge shots for bigger enemies
Controller and Keyboard support for up to 4 players