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!

There are still some problems with the build but I was able to play your game. Here's some things you can fix/improve on:

• Did you rename the executable? (You shouldn't do that) I had to rename the data folder to get the build to run. If you want a different name, change product name in project settings
• There were canvas scaling issues. You should select scale with screen size in the canvas scaler to make sure UI elements display at the same relative positions at any resolution.
• The game shouldn't quit when the player dies. It should restart or go back to the start screen.
• The jump height was too low and the hitboxes were sometimes inaccurate. I died a lot because of this.
• The player sprite (and parts of the environment) had unwanted coloured patches due to compression. In the import settings for your sprites, set compression to none. (as this is pixel art, exact colours are required)
• You could add background music for a more immersive experience.

Overall, well done for uploading your first game and working through the build issues. You will keep improving by joining jams and listening to feedback.