Hey, as Dr Hippo mentioned, the name of the executable can't be renamed as other files reference that name. I manually renamed the file to match and was able to open it up then. I liked the little pirate sprite you used, though I admittedly wasn't able to get very far. The first platforming area is quite hard. While I was able to make it past that early platforming area, it took a bunch a lot of tries. It may be helpful to introduce the player to the platforming with a little shorter jumps and then increase the difficulty/distance of the jumps later on in the stage/game once the player is more used to the controls.
When I died, it quit out of the the game. Rather than using Application.Quit() on death, it would be best to use SceneManager.ReloadScene() -paraphrasing the methods here.
Once I got the hang of the jumping I was having a good time leaping between the gaps and avoiding the spikes, however further in the level I got stuck at a steps-like area and wasn't able to move forward or back. I think if you keep at it, you'll have yourself a fun little platform. Hope you're able to get the build working properly!