Good start, but I don't feel it meets the Hub's standards. If you want help or feedback, the forum is a great place to ask.

• Make a proper icon. You can resize your icon for the hub using Image Resize app. When I started out, I even made the icon in hyperPad itself (though it was a bit low quality.)
• In the future, use the description to talk about what the game is (instead of telling us what complications you had)
• The joystick and jump button is in the way of the platform. I got hit by something I couldn't see because the jump button was in the way. Try raising the ground so the joystick/button isn't in the way of anything important, even give it a small opacity)
• Add a nice background to your game (included in game assets). The plain grey background really lowers the quality of the game, even a green color background would be better.
• The slimes/enemies seem broken to me. They move a little, then sink to the ground and do nothing anymore.

Lol not too bad for a first project. Something you could do is instead of destroying the player when it hits the spikes, you could use the Restart Scene behaviour (so you don't have to quit the project and re-open it to try again).