Thank you for checking out the game and leaving feedback!
Sorry about your experience with level 4. I was telling myself that I always have issues with difficulty spikes in game jams, and I did again lol.
The purpose of level 4 was to teach you the slow motion mechanic, and using the slow motion mechanic correctly should make the level a lot easier, but I completely agree that it was out of place. There should have been another level or two leading up to it, where we introduced the slow motion more gradually, and perhaps I should have framed level 4 as a boss fight of sorts, to allow the difficulty to make sense.
I had a great time with your game too, and I hope my feedback was helpful there. Is there any other feedback you would like to communicate to the team about Grapple Blast?