Positives include :
-Some puzzles are confusing but fun indeed
-Multiplayer ? Haven't tried it but if it works its gonna be GREAT
-Its like a japanese "lighter/friendlier(if i can say friendlier , ♥♥♥♥ can be tough)" version of Brutal Doom and unlike it Steam configures the game for you in dosbox so you have to do nothing except to play.
-For me a negative is looking for that god damn golden key for 45 minutes while the best time on the map is 4 minutes. Everyone should make it in 15-20 without previous experience. Lurking around after having killed all the enemies for a missing key is not fun at all.
Just started the 3rd mission and i give it a fair 8/10. Totally worth to play.
#I'd be glad if someone can tell me if its modable at any point.