Ikari no Yousai 2 is an overhead shooter with exploration and puzzle-solving elements where you move through rooms completing challenges. The progression is quite similar to the dungeon structure in 2D Zelda. You explore each room, collecting keys, opening doors, defeating enemies, certain things you do on a room affect the other, go and up down through different floors to progress, there are breakable walls and floors and you must fight a boss at the end. If you think that sounds interesting, please consider checking out the full review for more in-depth info.