Regarding the difficulty, we absolutely planned to have the lava increase as the player goes higher. We Left it for the end, but with some issues regarding the build and the deadline, we forgot to add it, so yeah, it gets extremely easy overtime haha.
The controls seemed fine until we suddenly thought at the end "why did we use the mouse?", it was an arbitrary decision made at the beginning of development and it just stayed like that, but when it was finished it just occured to us that it was a bad idea.
And I haven't actually considered mirroring the rooms, that is a good idea. Once the game jam is over we'll address these problems, because plenty of people told us about them haha, especially the difficulty part.
Thanks for playing it, we're glad you liked it!