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As a first game, I think this is a pretty decent game with good horror sound effects and made with decent horror game assets as well. Some improvements that could be made like changing the fonts of the text used because it seems quite out of place in a horror game, having a good ending in the game could be a good idea and extending the gameplay time by adding puzzles in the tunnel such as, fixing broken pipes or finding items to open locked doors etc. Moreover, I hope to see a more horrifying and original monster or enemy made in the future. Lastly, that was a great jumpscare at the end of the tunnel XD.
Thank you for reading my comment. I will be looking forward to see more of your games in the future. Be sure to invite me to play your new games when you make them :).