Finally tried :)
For me, you absolutely must keep working on this project! A great game can come out of it. The first thing to do is, of course, the controls. I would not go further until it is satisfactory and until at least a few people confirm it. It is probably the author of GMTK who said in one of the films that good steering is when you want to move the hero even without a specific goal, just for the sake of moving.
I love the graphic style! The atmosphere is great too.
Small but necessary things - more frequent checkpoints, the ability to reset the level from the pause menu (I flew through the wall to the void and had to start ALL the game from the beginning :P) and in case someone gets stuck and wants to continue, the "skip level" button (this just for a sake of a game jam, not full game of course). These are small, stupid things, but I think some people could get discouraged by the lack of it.
The game is great and I'm glad you made it after all problems with uploading! :)