Welp, I sure do get it now, why SofthouseChara went out of business.
They've made a big mistake with their focus on these lap systems, hence why Bunny Black may also ne one of their more successful or at least more liked works. While I think I can bear with it, unlike how I couldn't with Wizard Climbers (awful RNG on top), it is a big bummer still. It is also ironic how removing the turns would turn this into an even more awful grindfest considering that one would get the bonuses only once.
While there is a big appeal found in NG+ to add replayability, this is very different due to the sheer number of them and the inability to get a good ending plausibly without going round and round. It is also very different to Majora's Mask where the cycle carries a lot of meanings but, never mind being the sole one, stretching play time is not one of them.
Of course, the gameplay is also rather disappointing in other ways. Is it really that difficult to make a good dungeon builder games? Either one has Tower Defense games with or without third person action or this very restricted and also linear 'place either one trap or a combat unit per room (and the rooms are set)' experience.