These are a few questions asked by @KitSovereign over at Twitter!
Right now both Mouse and Keyboard is supported. You can use left mouse like you would use the A button on Rhythm Heaven Fever. Right mouse acts as B.
As for keyboard, spacebar is currently also set to A. I have yet to find an appropriate button for B though, suggestions are welcome~!
I plan to have roughly 10 or-so of minigames from the Rhythm Tengoku series ported. You’ll definitely be seeing some GBA stuff, that’s for sure (especially since it’s my favourite of them all!). As for DS, I do believe the space shooting minigame is a good candidate for a port.
As in, make a single event have a different pitch than the rest? It’s not currently a feature but definitely something that could be added! (sorry if I misunderstood the question)
Definitely!
Yeah the beatmap editor supports a wide range of beat divisions.
By bounce, do you mean different distance between each sequence of an event? For instance, that the monsters in Samurai Slice make the calls at
0.0b, 0.7b and 1.0b
versus
0.0b, 0.5b and 1.0b? (b being beat)
No, that’s currently not a feature. BUT beatmaps can modify minigame entities (objects) and thus implement this feature!
Not currently but definitely a planned feature.
Yes! Beatmaps can modify minigame entities, and even add new ones. So yes, entirely possible! 
Thanks for the questions!
Hey, thanks so much for the answers! Oh man, I’m really excited to hear this, because these are all exactly the sort of things I wanted to see. : D
Hmm… I’m guessing that if spacebar was A, then Shift/Enter/Ctrl would be good candidates for B. That would keep things left/right, and maybe allow for some of the “fancier” GBA games, like Polyrhythm or Tramp & Pauline. I never got to play the GBA version, so I’m really excited to hear that some of the original games will make it!
By “pitched cues”, I mean rhythm cues that play some sort of note, and play different notes depending on the song. For example, in Glee Club, the chorusmen sing different notes. Or, in Launch Party, the “countdowns” are different notes. If there are any games like this in Tengoku.Me, will the user be able to set what notes play (by having MIDI cues, I guess), or will it just be one sound effect? Of course, if there aren’t any songs like that in the game, then the question doesn’t really matter, haha.
Anyway, thanks for taking the time out to answer my questions! I’m super excited for this! : D
What about Multiplayer?
How About a release date