First off, "big-breasted girls who transform into cars" is an incredibly dumb premise that would be prime fodder for snarky jokes about how weird Japan is if anybody even knew this game existed. Thankfully, the game doesn't ask you to take it seriously, so this can be pretty safely overlooked.

Anyways, the game doesn't tell you shit about its mechanics. If you try playing it with what little information the game gives you, it's going to be a very repetitive, and sometimes needlessly unfair experience. Protip: go look up the GameFAQs board for this game if you intend on playing this. There's quite a bit of advanced mechanics/tactics that the game never tells you about, and it changed the way I approached this game.

Now, the game was... still repetitive, but at least not frustrating. To be quite honest, once you understand the unsaid mechanics, this game is actually kind of easy. It's a little fun watching high-level play where the player's zipping around the arena at incredibly fast speeds, but there's no real incentive to get to that point as even the hardest missions don't require that level of skill, which is probably the game's biggest fault. The dearth of content also hurts it, as there aren't that many missions and most of them engage in heavy recycling of stages and enemies.

If you're really interested in those kusoge oddities on the Vita, this is probably one of the more interesting ones IMO because of how the game's obviously low budget couldn't sustain the level of gameplay that this system had the potential for.