Thank you for your feedback!
The game should be completely playable with a controller, I just didn't have enough time to test it so I never bothered explaining the controls.
The level you're speaking of I think is level 6/10, but I could be wrong. It's not even one of the harder ones 😅, there's still a lot of game to go from that point (it's a hard game!!) If you want to see the solution theres a full walkthrough on the game page.
Thanks for playing! :)