This is great! You definately met your goal of making a successful N64 kind of game. Just enough familiar style to the best 3D platforming titles on the system for the retro feel, but definately it's own game. I could see FireWing being a successful mascot gaming franchise. It will draw similarities with the likes of Spyro and Mario 64, but it is for sure it's own game. I'm guessing that is what you were kind of going for. I think people would pay at least $10 for it if you would finish it and publish it.
I totally understand not being motivated to finish a project. Life is really busy! However, I noticed that there was another comment about a month ago that is positive and I'm sure there are others who have played that would like it. Feed that to your motivation factor. There are people who would play more of this game! At least update the release with more levels if they're ready. :)