I agree on the Metroidvania mechanics bit, we had bigger plans on introducing items better but we just didn't have enough time, haha.
I'll admit I haven't played around with game speed and feel as much as I should have, once things started working I generally moved on to the next feature. We're going to play around with it for future versions because we had so much fun working on this.
As for the Game Over screen, you have to press Enter. Sorry we didn't put a prompt there!
Thank you so much for playing :)