Thank you very much for this very complete feedback, I will try to answer all your remarks because you took the time to write them.
At first, I voluntarily increased the difficulty because after playtests, the level was too simple and the enemies were not really a danger. But maybe this buff takes Metroid Engineer away from the Metroid vania genre.
For the controller, I would also like my games to be playable with it, but I don't have a controller at home so I can't test the controls and the feeling, so I don't prefer to implement the controllers.
Then, for the spacecraft bug, I've had it for a number of versions but I don't know where it comes from. It's random but as long as it doesn't block the player, it's not a big deal.
Finally, the ladders are half bugged, I noticed the strange behaviour when the player jumps but I decided to keep it because it makes it easier to move around the LD in some places. I'm not a big fan of adding a special button to climb ladders as the controls inevitably become more complicated to learn. But I'll take what you said there and test it in my next platformers.
Thanks again for your comment.