This game is a rough gem. The are two main modes:
1. A whole slew of various puzzle levels that educates the player on how the various enemies behave through game play. These are enjoyable to play on their own.
2. A "adventure" mode where you try to survive in various rooms with randomly generated enemies. You look for and attempt to pass through doors numbered in descending order. I am finding this mode to be very challenging and in a good way!
There is a third menu item for a mode where apparently you can edit and build your own levels, but I have not been able to make sense of this. Perhaps it is unfinished.
Despite the games flaws (no explanatory text, lack of Game Center support, and an apparent lack of polish), I could not recommend this game enough! The simple graphics and sound works great for this game and I am finding the game play to be quite compelling.
MarinasideSteve about Ending, v0.2.3