I've added a small gameplay video to the page, I don't really have much free time in my hands right now so it is simply me playing the game, but eventually I can try to add a video that actually explains the game, something like a guide. Still I hope it helps for now!
But going over your issues, the green cubes are actually something you are supposed to destroy instead of touching and the bullets play into the main mechanic of changing the "mode" your hands are currently on, try to press down the thumbstick and then the cube in your hand should change color, one of the UI icons in the HUD should also reflect that change.
The game is still simply a prototype so I'm aware of some issues with the controls and even with the balancing, and eventually will try to fix them whenever I go back to developing this game further.
If you run into any more issues feel free to ask! Any feedback is welcome here :D