I agree with all the comments pointing out that an in-game tutorial would’ve been better, but I will try my best to explain it here. The core mechanic is the time manipulation (UI Slider on the top screen edge). Just drag that slider around to move through time. Then, at any point in (valid/not red) time, you can add a force to any physics-based object by just dragging. When you are done creating a force hit the play button (bottom left) to re-simulate the new timeline. If everyone survived you can move on to the next scene.

Yeah, I totally agree that sounds would improve the game feel tenfold. Sadly I didn’t know how to approach SFX in a game where you can move through time pretty much until the last day. I have had this idea to record them in a similar way to the dynamic objects motion and velocity and to play them back when the time slider gets moved but sadly it was too much to add as I’d have to create my own sound file data.

Instructions, on the other hand, I didn’t even think about apart from the description on the Itch page so thanks for pointing that out to me. I think when I playtest a game I forget that I’ve been through the entire process of its creation and therefore already know what to expect and how each mechanic works down to the source code.