Basically yes. The game currently only has a sandbox mode that does have money, but you can't go bankrupt. Going bankrupt and scenarios/campaign will be added later (and the sandbox mode will stay too of course). I don't seem to have permissions to fix that in the OP but yes, we'll be active over here too of course :)

Off the top of my head:
- resource system for shops, i.e. shops need to get restocked by delivering resource crates to them (not as tedious as it might sound, it works pretty much automatically - kind of like it does in Prison Architect; you do have to put some thought and planning into it). Special park infrastructure related to that (employee only pathways so Haulers don't get in the way of your park guests; in the future there'll be more special infrastructure just for this system); trash works somewhat the same way in reverse
- much more freedom when building stuff, e.g. way more track building options since you can bank almost any segment more fine grained than in the RCT series, any track segment can be built diagonally, track segments can be scaled so for example you have a large variety of loop sizes or curves that you could use instead of a small amount of predefined ones, tunnels can terrain at any angle instead of having to terraform land in a special way in order to build a tunnel, can combine scenery items very freely (I think there are mods to somewhat allow that in RCT 1-3), some scenery items are scalable (like rocks), the majority of scenery items can be freely colored using RGB color picker, a bunch of scenery can be built off-grid
- better guest AI, e.g. actually using transport rides to go from A to B instead of using it like a coaster, not getting stuck in the middle of the park like they could in RCT1/2
- overall usability improvements, like being able to drag-build paths and fences, repaint already placed scenery, save scenery color palettes, the blueprint system that lets you put scenery + rides into easily shareable files (I think RCT 3 had a limited version of this), nice visualizations for coaster stats (kind of like heatmaps) and other park stats such as where trash is or how happy the guests are; basically a bunch of smaller things but they add up
- full modding support (I know there are tons of mods for RCT 1-3, but they are done somewhat unofficially and thus limited in what they can do. There are already mods for Parkitect that go beyond what you were able to do in RCT 1-3)

That's what we have right now. It's probably not a complete list and we still got a bunch of development ahead of us. I contacted the GOG team about it. The CAD price should match the Steam price now and I've been told you'll be refunded the difference.

A dedicated graphics card is just preferable, but it should work on pretty much any integrated one as well (obviously with lower performance). My development machine got an Intel Iris as well so you should be safe. GOG allows refunding for 14 days after purchase though without any questions asked, so if it doesn't run you won't have any trouble there.

Yes! We've got some community translations in the works, including french. If you could help with that it'd be awesome! Our translation community is over at translate.themeparkitect.com and it'd be especially great to vote on already existing suggestions instead of adding new ones.