Thanks for the feedback! If you struggle while shooting the 'hive' (the enemy that spawns insects and rats), the key is to shoot the hive as much as you can, then go back to the safe place between the two flowers before the red colour effect begins. Then you wait until the effect ends and repeat.
If the issue is with the jumping section, you just need to wait until the colour effect ends, and start jumping, so you have enough time to get to the other side.
About the ceiling, it make sense to have an outline. We'll fix that in the post jam version.