1. The length of the day felt fine to me. Not too short, not too long.
2. The amount of time before oxygen running out felt fine, gave me plenty of time to do things but I did need to occasionally refill it.
3. The events were a bit confusing to me- I didn't know what the sound was at first and I wasn't sure when I could fly the ship. Also, if you just avoid the rooms with enemies/fire does it actually penalize you?
4. The enemies felt pretty easy to me. They could have slightly higher health maybe.
5. Drop rate felt fine.
6. I would make the event warning smaller, since it took up like half the screen and never went away. Having it disappear between events would also be nice. Also more info on how/when to steer the ship.
7. I would rate this like a 5. Lots of things going on to pay attention to so there's a bit of a learning curve but not too bad.