How did you use Houdini to make your game?
All of the models and textures (texture masks, used later in UE to get the final result) are made in Houdini, excluding LUT-texture used for color-correction in UE and ambient cubemap.

List everything that was made before the jam. Pre-built assets, textures, etc
None, all of the models, textures, blueprints, caustics texture (also made in Houdini), etc - I've made in last three days.

Which game engine or platform did you use to make your game?
Unreal Engine 4.26.2

List any instructions and tips for playing your game here.
Use WSAD or arrow keys (also may by joystick, i havent' it, can't test). Eat fishes smaller than you to grow, beware of big fishes or they can eat you. As you grow, the fish around you will also get bigger.