And I always end up with a new idea every so often, so fuck it let's post them here.
Feel free to poach the idea, but please credit me and also feel free to get in touch if you want someone to bounce ideas off!
My current thought is what if you made a racing game set in a city, but you can't properly race on the streets cos there's too much traffic. So the solution is you have cannons with grappling hooks mounted onto your cars and so you get to do mix of swinging and driving (think like, driving on the sides of buildings while you have the upward momentum so you can build forward speed) and maybe crashing through buildings and stuff, maybe even crashing into other cars which are swinging. You could also do the burnout thing where you just have to cause as much property damage as possible, and maybe you can do puzzle modes where you have to get to X or knock over Y with a limited number of grappling hook shots. Potentially, you could have an unlimited grapple hook mode, or modes where you have to go down to the ground to pick up more grappling hooks even do a crazy taxi thing and have to pick up and deliver passengers around the city.