The port is truly impressive and remarkable at the same time. I have been playing it for a while now, and I would like to offer the following feedback.
For it to become a fully-fledged game, a save function would be important, at least at the beginning or end of each level.
There are also many objects that can be collected, such as keys or ammunition. However, there are also numerous objects that cannot be collected, such as torches and similar items. These objects are not essential to the gameplay, and the game would be much clearer and easier to navigate if they were not visible. This would help create a less cluttered visual experience.