Yeah I was aware of that jump glitch, it wasn't expected to be like that, but unfortunately there were quite a lot of things I wasn't able to finish and fix in time. Whereas, for crash screens, I think yeah I should have tried to make it like something that the player can somehow guess what the solution should be, perhaps some kind of hint. Clicking could also be a good idea as you said.
Thanks for the feedback, I will be keeping these things in mind and hopefully try to finish this game as soon as possible :)