I wanna be the Six Elements(共同開発)
Doruppi's stage is themed on Super Mario. Gray spikes kinda of ruin the visuals, but they don't appear too often, so it's alright. Both are really fun and have some funny traps. The boss is a bit RNG-ish, though, and I didn't enjoy it that much. Nothing is particularly hard, which makes it a good intro stage.
Carua's stage is a huge difficulty spike in the game. The platforming becomes a lot more precise, there are more traps and some of them are really unforgiving. There are three bosses, and I can safely say that I hated all of them. The first one is annoying because the platforms make you fall when you least expect them to, the second one is simply extremely RNG-heavy and her spears are annoying as hell, and the third one has a lava attack that forces you to do an annoying long jump to avoid it. It's too hard to be the second stage in the game, and the bosses are terrible, but the platforming is kinda of interesting. Good sound effects after the end of each fight, makes each victory sound like a huge achievement.
Yuutu's stage is quite interesting, reminding me of Call me it's first avoidance. It's a boss fight mixing platforming, avoidance and shooting phases. The visual effects are quite annoying, mainly because some can make you die without even knowing what killed you, but other than that, it's a cool fight.
Poroniumu's stage is actually beyond what I expected when I saw the first screen. It's themed on the original IWBTG, and I tend to hate stages like this, but this one is surprisingly fun. Funny traps, interesting gimmicks, quite amazing overall. The IWBTG quiz had some questions that I doubt that anyone would actually remember from the original game, but other than that, I really enjoyed it.
Very's stage is quite short and some jumps seem unnecessary. Could be better if it was a bit longer, with easier saves, but it's nice as it is.
Sureiru's stage is actually the last boss, and it's quite disappointing. It's Kirby 64's last boss without some of his attacks. It's actually easier than Kirby's version. It's not bad as a boss, but it doesn't feel like a last boss. Meh.
Great game overall. Would recommend.