Thank you a lot for your kind words! To be 100% honest I kinda realized pretty early on that the "one screen" idea didn't have as much mileage as I thought it did, and at times I was close to giving up on the project completely. I'm glad I pushed through, though - and I figured at least the game doesn't overstay its welcome!
Another problem was that this was my first time making a Metroidvania and I spent a long time just making the controls. I think the camera and gravity powerup alone took nearly half of the time allotted. At that point, I didn't really have much energy left to make enemies or the actual level, especially since I also had to take multiple days off due to losing faith in the project. I think the lesson for the future is to stick to basic mechanics, especially if it's my first time making a game in a particular genre...
P.S. If you want to see more adventures of the (admittedly very rat-like) dinosaur with a gun, you could always check out my first game! It is much simpler in terms of gameplay, being a simple space shooter, but there's more of a story focus (and at least one gun). ;)