Hi! I Loved the idea! A couple constructive comments:
- There is a big glitch: Since the window don't have limits, you can just go to the left until you fall out of the floor collider and you just wait (while falling) and win
-It would be very fun if you add a DASH ability. Maybe it can consume stamina or something so players don't abuse of it.
- It's very difficult, maybe the red lines could appear sooner. It really doesn't give you time to react.
- Also, you could make several short levels, or just checkpoints, so you don't start all over if you die at the end.
Again, great concept!