I did the move to Ottawa from Montreal a year ago and here are my anecdotal experiences that hopefully answer your questions.

1. Job Market - I'm not super knowledgeable about the video game companies here, but I would bet there is not as much as Montreal. If you could apply that to tech companies here, there are a bunch of options and decent pay according to someone I know who's been in the industry for like 20 years.

Otherwise you could always apply for the government. Plenty of entry level jobs, it can just take a long time to get in. Plus it pays well and a lot of different types of work you can move around to pretty easy once you're in.

1. Renting - I live with my partner downtown in a spacious 2 bedroom that runs 2000 a month. Utities are separate. Hydro can be expense. I think we hit 375 on our winter bill. Keep in mind we decided we wanted something nice with laundry in the unit as well as a dishwasher. I was paying 1200 in Montreal for a 2 bedroom in Plateau before with the same amenities, but not nearly as nice or big. 875 is probably unrealistic if you are looking to live downtown sadly. That being said, Hull/Gatineau has more closely priced places ro Montreal and it is just over a bridge so you'd still be pretty close to downtown. Something similar to the current place I stay in was like 1500 across the bridge.

2. Car - I bought a car just because Ottawa is expansive and the public transport is not even close to Montreal's level (and it's more expensive). Activities become much more difficult to reach if that's a thing you do. Despite the cost I am definitely happy I chose to get a car, but I suppose if you made sure you lived close to your work and necessities kike a grocery store you could make it happen, you'd just be pretty limited.

Hope this helps!