I developed this 2d game inspired by the famous Metroid (of which I accidentally found the sprites online, and hence the idea). Initially it was a game that should have been composed of countless levels and a campaign with a final boss, and indeed the logical structure is already ready for this type of development. However, due to the desperate lack of time, I had to leave the game in survival mode only.
The game is developed by 0, without the use of any framework (at the time I was studying the structure of videogames) using the graphics API made available by the HTML5 Canvas. If you are interested you can play it here