Sucking ghosts into bottles was such a surprising but satisfying mechanic! Overall, I really enjoyed the effects you put into the ghosts. And whatever post-processing effect you had while mutated was wicked! The music you chose felt pretty perfect, too. All in all, this is a fantastic game for a jam!
I also appreciated that you were able to add in a pause menu (something I didn't get time for). Being able to restart once I completely wasted the first mutation was very welcome (see my note below), since many other games I have to reboot/restart. In the final room, I definitely went into the harder of the two doors first :P But that's okay. Overall, I found the level layout to be very pleasing and not a challenge to navigate. Great job!!
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(The rest is moot, since I was typing this up as I played. Eventually I realized what the mutate ability was for: just a nice speed boost and night vision, so you can take my comment however you like!) You did a good job introducing motivation for the mechanics (ghost appears, place the bottle!) at the beginning. So when I finally got that 3rd ghost and discovered the "mutate" ability, I thought it had something to do with the large door in my way. I thought as a ghost I'd be able to: fly? phase through walls? But what that means is that I thought I had wasted my mutation the first couple play-throughs, rather than just continuing to explore (and finding that trick wall!) :(
Personally, I realized how important it can be to introduce new mechanics with the motivation (or explanation) of what to do with them. But with a little experimentation, I was able to figure it out.