Highrisers will be available for PCs with Windows, MacOS and Linux. We will consider console versions once we have completed the pc versions; so it will be a post-lauch feature. Mobile platforms would require a lot of redesign and are currently not planned.
Currently, it is not planned. You control all the four characters with the mouse like in a RTS: You select a guy, you click where you want him to go and he starts walking.
We think Highrisers could be a hilarious multiplayer game, but for now, we just want to focus on creating a great single player experience. As we got a lot of request for that feature, we are considering a post launch update that will introduce multiplayer (as in Klei's "Don't Starve Together").
Well... we think no; that's why we branded it a Survival-RPG, as in our eyes those are the most defining features.
However, there are parts of the game which clearly do belong in the mentioned categories:
The nightly crawl of the dreamers up from the lower levels does call for clever placement of traps, turrets and barricades - key elements of a tower defense game.
And the procedural level generation to increase replayability and other elements (yes, we are considering permadeath) do go in a roguelike direction.
This refers to ingame time only - a day in the game will only take several minutes in the real world! (We have yet to determine exactly how many minutes, but this will be a topic for extensive playtesting.)
Highrisers is not like a mobile waiting game and there will be no premium currency or boosters or any kind of ingame payment whatsoever.
Don't see the answer to your question? Ask the project creator directly.