Overall, one of the best compilation of the wadpak series. Episode 1 is really solid and the best of the series, episode 2 starts with a ugly looking dm arena (that is on HEROES.WAD iirc at the same spot) but from E2M3 starts to become good, with the expection of E2M7 that isn't a real good map imo and Episode 3 been the worst of the pack, with a pair of good maps (E3M4 and E3M9), that crazy map that is E3M6 (no really, is the weirdest map i've seen so long!) kinda followed by E3M3, that Mt. Erebus / MyHouse.wad strange mixture that is E3M7 and overall pretty mediocre / bland maps. Also you start with all the guns right at E3M1, ok.
Yet another newbie stuff from Jeremy Wagner. This is however superior to its predecessor, but still not great. We now know that the getting-stuck situations are deliberate. Here's a hint: whenever you see a room with two switches, save. One of them is bad and will shut your progress.
I must commend the author for adding HHE and custom sprites though. The HHE is interesting because it replaces the Ethereal Crossbow with an Ice Crossbow, which in good Raven tradition fires fragmentation shard projectiles (the ones fired by the Iron Lich), and they work perfectly with the player. It also makes the Crossbow really powerful on its own. The only port I know which can load HHE is Chocolate-Heretic. Use
-file incubus.wad -merge sprites.wad -deh hack.hhe -hhever 1.2
to run it.
Unfortunately the mod is really not stable and is prone to crashing Chocolate-Heretic, so it only gets 1 star. Sorry. Without the crashes it would have got 2 stars for the modding effort, because the level design is still bad.
A fairly solid level, with some odd design decisions. It seems to be the first wad with a sizeable slaughter scene. It's also the first wad which uses the E2M6 music. One warning though. After the blue key, there's a deadly crushing floor. Either save before it or make sure to run fast. The level also seems to have a quick exit, though it's not obvious.