The videos I've watched intrigued me, but the gameplay looks sooooo slow. How does it feel to you? Clearly you enjoy it, and I'm sure I would, too, but it just looks like your character is moving through molasses the whole time.
Well I think pacing is great.
At first you just move around exploring (there is a ton of exploring...linear at the start but then it opens up big time), enemies don't pose any challenge because you have all the time to recover and kill them.
The probe reacts to physics (actually everything does) so when underwater you are way slower, not sure if you saw those videos.
3 hours in I started to die pretty consistently, fast dodging around enemies and bosses, I'm probably in a area I'm not supposed to be in.
There are some parts that require perfect controls and timing, they are super frantic (I have yet to beat any of them tough, maybe I need some more powers or I just suck).
But at least at the very start it's a exploration game so you move between screens enjoying the vistas (some are really breathtaking) and solving some light puzzles.
It's no different than Aquaria or Waking Mars if you know them.
The game gets really difficult anyway.
Hope it helps!!!