A sci-fi game where players are thrown into a randomly generated, yet symmetrical map and have to gather resources and construct giant/small robots/spaceships/vehicles to defeat their enemies.
Kind of like "Dota meets Minecraft meets FTL". I know those "X meets Y" comparisons are bland and bad, but really, it's the only good comparison I can find atm.
Each character has their own sets of unique abilities, but those are used mostly for utility rather than killing. They also have access to their own, unique recipes/blueprints, but everyone or almost everyone can also benefit from readily-available designs for the more basic things. It would be based on "modules" which can be connected to other modules (sometimes only in specific positions, and most modules can only be connected to so many other modules), each having their own stats like durability, power usage or mass.
Some modules would provide extra power to the entire construct and act as generators, others would be your various kinds of dakka like lasers, missile launchers and miniguns, then there are locomotion modules like jet engines, wheels, tracks and wings. As well as a plethora of other things that can be beneficial like EMP blast module which disables random modules in enemy ships for n seconds, or a remote control module which lets you control another robot provided it has a "receiver" module installed - since otherwise all robots have to be manually controlled by at least one player, and certain modules can be manned.
However, to prevent the enormous death fortresses from flying around the place, you have to buy a hull of a vehicle that you can place your modules into. Some modules can only be put on specific hulls, and certain hulls provide bonuses to particular modules.
Outside the matches, which can be as small as 1v1 or as big as 10v10, you can unlock new characters and modules, but there's no "dual" currency - all purchasable gameplay elements are gained solely with the "free currency" which can be only obtained from playing, though they're gained at a higher rate than most other games do these days (I hate grinding for things in all games...) and you can at best make cosmetic purchases with real money...Actual real money, not a secondary currency purchased with real money.
So yeah. Sounds like a combination of already existing titles, but if done right it could be a big thing. Sadly, it probably won't, since the devs would inevitably make some terrible design decision that would drive a fair amount of people away from the game.