Very good!
Because your making this into a full game, I have just a few bits of small feedback because I'm too bad at game design to give you any big advice
- The crystal spikes in the first area don't really scream THIS IS GOING TO KILL YOU, so I ended up jumping into them quite a few times
_ There were quite a few times in the bubble area where I ended up falling down into the bubble elevator and being flung back up or accidentally jumping into it, so that should be altered a bit to make that less likely
- There should be some indicator for how the rooms link up, like colors corresponding with keys that are needed or are there