Yeah I left the instructions a bit unclear, because I was too tired to take anything seriously lmao.
I will update the game page now to include some better explanations and instructions.
I kind of didn't have time to properly implement your bazooka, so I left it in a secret since it was brutally overpowered. If you collect enough power (the line needs to go way above your screen (about two times as much)), the line turns dark blue, and you can activate the bazooka with the space key.
Glad you enjoyed :)
Edit: I changed the page, so there is now more clarity on what to do.