[F1] - Summon a window of settings that lets You make Bricks smaller than previously allowed among other fun and useful settings to toy around with.

[F2] - Hide the HUD, useful for Screenshots and photography. Unpress it to summon back the HUD.

[F3] - Summons a window of Debug Settings, similar to the [F1] window but contains different settings.

[F4] - Enter 3rd Person View. Unpress to revert back to 1st Person View.

[F5] - Enter NoClip Mode. Feel free to just fly through walls, the floor, both, or anything! Also useful to unstuck Yourself. Unpress to exit NoClip Mode.

[F6] - Photography Mode that Detaches the Camera from You. It comes with its own window of instructions provided Your HUD is summoned on [F2]. Unpress to exit Photography Mode.

[F7] - Does literally nothing!

[F8] - Summon the Space Battle Editor, a system that allows You to summon friendly, foe, or friendly and foe ships. There are a bunch of additional settings associated within this mechanism.

[F9] - Does literally nothing!

[F10] - Does literally nothing!

[F11] - Does literally nothing!

[F12] - Take a STEAM screenshot.

[ESC] - Can be used instead of unpressing [F1], [F3] & [F8] to exit them.

I will add more to the Guide in the future.......hopefully..:P