MAP01 : Pretty fun starting level with nice visuals and combat. Nothing really hard, but you will need to watch your ammo since it is scarce.

MAP02 : This level introduces the lava gimmick and the mars red aesthetic of the whole WAD and does a really good job, love the visuals of this map.
Combat is pretty fun too, with multiple levels and enough space to circle around; I am not sure if that last part worked as intended though, but it was still fun

MAP03 : Evil

MAP04 : A gimmicky level with short surfaces to move around and avoid the lava while you go all up to get the final key. Gameplay is fine, but some of the combat encounters are a little too much static for my taste and the visuals are kinda ugly. That Cyberdemon fight at the end is a bit award too

MAP05 : Fucking insane. That starting room is incredible hard, specially if pistol starting, but once you get moving with a bigger arsenal it becomes a really fun mini-slaughter map.

MAP06 : A stepback on difficulty to the previous one but without getting easy or losing motion. It really knows how to build tension with it's traps and have some nasty sadistic jumpscares too. Also a much better Cyberdemon fight

MAP07 : Map 7 is an open area which you can approach by different ways going on the order best suits you; is also the one that uses the episode's gimmick more, and in a creative way too, with moving lava floors that reveal more portions of the map full of nightmarish demons ready to fight. Is a hard level. A really hard one, but also a incredible fun one that rewards the player for their skills and map knowledge.

Overral the first DBP is a pretty fun short episode that shows the potential the Doomer Board guys had, and will later develop even further.
It does have some problems though, some of the levels seem to lack proper testing, MAP03 is a crazy difficult spike and the visuals, yet good, are not close to what DBP will offer later. Even then, is a nice first shot