A big review from a big Doom fan
I'm a HUUGGGEEE doom fan, which is why I was so quick to click on this link. The first thing I prayed was that it wasn't as lame as the previous "Doom 2D" dos thingy.
It was actually pretty good. The graphics were ported well, and the backgrounds had a good scroll, so the graphics were good and all the animations were proper.
The controls worked, although I do think you needed a crouch button because it was often hard to dodge bullets and projectiles, in fact it was nigh impossible unless the enemy was on a ledge and you were below, hopping and popping. Even trying to jump over projectiles didn't seem to work.
There were also some collision problems with the platforms, not only could DoomGuy stick his head through a platform and if the game was feeling mean, get stuck like that, there were times that I would land on a platform and go through it. It seems more of a glitch than a programming error, because other than my head going through the platforms, falling through them doesn't always happen.
Otherwise, it was actually an admirable attempt to bring us a sidescrolling Doom game. :)