I played this for a couple of hours last night.
It's pretty entertaining, so I thought I'd share some impressions.
For those unfamiliar with the Egg Monster Hero (Hanjuku Hero) series, it's pretty much a spoof of the RPG genre, and makes lots of self-referential jokes as well as nicking bits from other Square games. The DS title is no exception, with egg monsters like Moogle and the same battle ending music as the FF series. I get the impression that the comedy value of the series is more important than the actual gameplay.
That said, gameplay isn't as bad as I expected. The battle system is "scratch and touch". Default system on encountering an enemy is "scratch". You have your army and the enemy's army, and you scratch the screen to attack, pushing your army into the enemy. The soldiers fall depending on the ferocity of your scratching, and when all the soldiers are dead, you take HP off the leader. The "touch" part is where you summon your egg monsters. Any time during the scratch battle, you can hit the toolbox to pop up your egg monster list. Unless your egg(s) are broken, you can summon a monster and it will start off with full HP each battle. When an egg monster is summoned, its picture is split into 9 panels, and you choose which panel you want to attack with. For example, you may choose the panel which contains the trident the moogle is holding. If you enemy also summoned an egg monster, you choose the panel which you want to attack, as you try to find the weakpoint. Attack the chest of the sexy mermaid, and she goes into a rage and slaps you up for being a pervert, but her tail is weak and can be attacked easily.
At first you only have one egg, which allows you to summon 3 egg monsters. As you use them, the egg improves and you can summon more monsters with it, but if it breaks (when any of the monsters reaches 0HP), you can't use it again unless you ask someone at the castle to fix it. Fortunately, later you can get separate eggs, with another bunch of egg monsters within, then you have more options to play with.
So the battles are fun, no doubt about that.
The whole of the game is set on a stage, and the bottom screen is the audience when you're not battling. People walk in and out of the theatre all the time, and speak with each other, taking jabs at your performance, or just general chit-chat. This is going on ALL the time, so you can read it for laughs or you can ignore it. This is made so much better, though, when you beat the first boss and she walks off the stage and takes a seat in the audience. The characters on the stage then poke fun at her, and it all gets a bit silly. Maybe it's a bit daft to most people, but when you've been conditioned to what Japanese people call comedy, it's actually quite amusing.
Aside from that, the game is pretty predictable... the story so far is straightforward stereotypical RPG stuff. It's probably done this way as part of the parody, and may change later. Who knows. Graphics and sound are all SNES-like, which is no bad thing at all.
Dungeons so far consist of searching for a key, opening a door, getting another key etc etc. You can avoid the encounters pretty easily, but some encounters are necessary to find keys. There are items in scenery, which seem to fall into three categories: items you use there and then to boost your stats (wear equipment, or drink medicine), cards that you can use in battles (you can only hold 4), and important items like keys.
So a couple of hours in, I'm keen to keep playing, but I can see why this is not a massive series. Maybe the DS game is more fun than the main Hanjuke games because it's more RPG than SRPG, but I fear for my screen