http://insideastarfilledsky.net/An unsual little top-down shooter by Jason Rohrer, the creator of Sleep is Death and Passage.
What is it about?
http://insideastarfilledsky.net/bulletPoints.php-Your screen will be black with bullets.
-Enter things.
-Procedurally generated everything. Almost everything.
-100% boss-free.
-This game would not exist without the inspiration that I drew from games like Spelunky, Shoot First, Disgaea, Borderlands, Everyday Shooter, Psychonauts, Soul Reaver, and Prey.
-"Larger than the known universe" is not an exaggeration. You will reach the relative scale of the known universe after level 14.
-165,000 basic weapon combinations is a lot.
-"Infinite" is kind of a misnomer, because 32-bit integers run out eventually. You will reach the upper kill screen (one step up from level 2,147,483,647) after about 2043 years of continuous play. Though with diligence, you can reach the lower kill screen in just 68 years.
-53 people tested this game, and they played it an average of 10.89 times each.
-This game is a tactical-situation generating machine.
-That little guy at the top of the page is cute, but I'll never see him again.
Whenever you reach the exit of a level, the level becomes your new character and that character will have the power-ups you picked up during the level.
You as well as every enemy and every power-up is also a level. You can go inside enemies and powerups to play the level inside them.
When you enter an enemy you can change the power-ups they have by picking up new ones while you are inside them, which is useful for weakening enemies that may be to difficult.
When you enter a power-up what power-ups you pick up while inside will determine what power-up it becomes, which is useful for trying to get a specific power-up.
Keep in mind that levels inside an enemy or power-up usually have a difficulty increase.
If you die, you are sent inside yourself. It is possible to be inside several instances of yourself, enemies, or power-ups.
I once came across an enemy that was shooting so many bullets that were splitting into more bullets that I couldn't get past it and to the exit. I went inside the enemy to change his power-ups so its shots wouldn't be so powerful. Inside the enemy I ran into several enemies filling the area around them with numerous but short ranged bullets, so I went inside a power-up in an attempt to turn it into a range power-up to increase the range of my shot enough to shoot them while staying out of reach. I ended up getting killed twice over inside the power-up, so I was inside myself inside myself inside a power-up inside an enemy. It took me several tries to fight my way back up through the layers out of the power-up and back outside the enemy so I could get around to finally killing it and reaching the exit.