If you're not going to be doing 3D projects at all, or at least not graphics intensive 3D projects, basically any new laptop with a dedicated GPU will be amazing for you (I'd look for something with an Nvidia 1050, a lot of those on sale for under $1000 on black friday / cyber monday)
I'd prioritize:
- feel / weight -> do you want something portable so you can work on your lap / from a plane / in a coffee shop? Then go then and light. Try to go to a store that has the laptop so you can get a feel for the screen and the keyboard / trackpad combo
- how big a screen do you need? Will you be using this in conjunction with an external monitor on a desk? Personally, I prefer a 17 inch 1080p screen on a laptop if I'm going to be using it port-ably, but if I'm hooking it up to a monitor, 15 inch is fine. 4k feels like overkill on a laptop to me.
- dedicated / non-intel graphics (though for what you want to do, the most recent intel integrated graphics would probably be fine, but getting a better gpu will help the laptop last you a lot longer)
- 8-16 gigs of ram
- as big an SSD as you can get - at least 128gb, ideally more. Your OS will be installed on the SSD, and you can have a traditional laptop hard drive in there for other files.
So, like something like this
MSI at Walmart for $799 would be great for what you're looking todo, and should support Unity and Game Maker versions for many years in the future.
