ZDoom

Type: single / cooperative
Sub-genre: priority on puzzle and mystery obstacles
Platform: ZDOOM 2.7.1 rel, Ultimate DOOM WAD
Length: one episode.
Current version: 0.7 https://yadi.sk/d/EkyfhWSkm7yH2
Warning: contains ponies (OC only). May be a bit easy action-wise (but puzzles are supposed to make up for it).

Current version issues: one optional area in E1M6 doesn't have exit. NPCs have insufficient animation frames implemented. Lot of graphics are placeholders.
edit: fixed E1M8 battles; E1M5 red door lock; E1M8 flipped teleport line
edit: added frames CivilianOne:melee, ZebraBoss:melee, added ZebraBoss (E1M6), edited and populated E1M5
edit: added frame CivilianOne:out, added SentientAtom boss, completed pillar ride section in E1M6
edit: added two bosses, added volcano sprite
edit: added crawler enemy, two maps, some changes
edit: added NightmareThing and LavaBoulder sprites

Well's top (E1M2)

Spoiler:

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Strange room no.3 (E1M6)

Spoiler:

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Hotel area (E1M5)

Spoiler:

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At the character selection i can't really say if i'll be playing a cat or some kind of pony so i'm assuming it's a cat so here is my impressions based on that guess ...

First the technical stuff ... the font of the menus and the in-game messages is too big, reducing it a bit would help. Also a small tutorial about how the the game is supposed to be played would also help. Being a cat if fun but how is a cat supposed to defeat monsters like a Baron without any good weapons? Good thing the cat is speedy as hell

Second the custom graphics ... not bad, the projectiles and the "ponies" look a bit cartoon-ish but i think that was your intent and honestly i think they look good. If they are placeholders they are good ones

Those are my impressions based on my play of the first map, more to come once i played all the maps.

NOTE : Some screenshots of the maps could help promoting your wad, just saying.