Need more games like this
Note: I'm rating the full game, didn't play this demo. And I'm french so I do hope it won't be too hard of a read.
This game is a lot of fun, a nice (somewhat disturbed) take on the roguelike genre.
Simple to get into, hard to beat.
The player doesn't need a long set of instructions, after a few key strokes he's ready to leave the first empty room and face the awaiting challenges. However, there's a lot of different enemies, items and generaly speaking things to try out and learn before getting a real shot at beating it. You really feel like you achieved something when you do (twice).
Randomness put to good use.
A game can be boring if too random, or offer close to no replayability if not. The right way is often to mix both random and procedural generation. The Binding of Isaac does that very well. You'll keep coming back for more and still be surprised.
A very original world.
I really wonder where Edmund gets his inspiration. Switch Isaac with an elf with arrows, ennemies by orcs and globlins, his mother by some giant troll ... The result wouldn't be quite as impressive.
Very very good job. I really hope it gets the success it deserves.