Solid entry! I thought it played pretty well and fit the "Game Boy Era" aesthetic well. The few of my issues were mainly UI related.
1. The viewport is very small and hard to play without zooming in or going full screen, which I was unable to do because:
2. I wasn't able to disable the cursor lock for whatever reason. Maybe there's a conflict with the Escape key in-game? Whatever the reason, I wasn't able to click the fullscreen button either.
My last thing is just with the keyboard input. It might be easier on a console or with a controller, but it was very hard to spam the arrow keys to quickly avoid the oil/void stuff. My workaround was using both the WASD and Arrows to move quickly. Once I did that, it was pretty fun. These aren't major issues and are more fine-detail things. Overall, I feel you did excellently. Congrats on your submission!