I don't like the german voice at all. It just sounds like some Rando trying to do an impression, rather than someone who's voice sounds naturally similar to Charles's. The other languages sound pretty close though.
Also, Why did they not bother to adjust the lip synching for the other languages? It's literally just a two-frame animation they need to turn on and off. It wouldn't be that hard to do.
Heck, a ton of hobbyist youtubers do their own lipsynching for their animated avatars, why can't they?
If they're not making the animations smooth, they could at least give them good timing.
Speaking of the extremely minimalistic animation, I wouldn't mind it so much... If it didn't come across as so... cheap.
Game & Wario also had simple animation, but it had a lot of polish in small and subtle ways. It felt simple on purpose. This kinda seems simple to save work.
I felt like Game & Wario and Smooth Moves had the perfect balance between animation that's relatively easy to make and animation that still is pleasant to look at.
This is coming from someone who has animated quite a bit before and knows how difficult animation can be, so I can sympathize, but I also think games should always be compared to their predecessors in terms of quality.
The minigames themselves on the other hand look great, btw!