It's a Metroid themed Doom map. Metroidvania-style.
This is beautiful.
The progression is super entertaining, the map is huge with many areas to go and a lot of mysteries.
If this were on Steam I would have paid for it (I would pay for a second part too).
Honestly, it's a great mod. I'm not just saying that because I worked on it, it was great before I even touched it. Spram obviously had a passion for Metroid, to create a Zero-Mission-meets-Super-meets-Prime-meets-Doom experience that works this well. What can I say? It was a blast! Played it once, made some changes, would totally play it again.
Great mod, brings Metroid NES to Doom.